feat: initial commit of weeks 1-4

17 files changed, 1540 insertions, 0 deletions

diff --git a/.bazelrc b/.bazelrc
new file mode 100644
index 0000000..fda09fb
--- /dev/null
+++ b/.bazelrc
@@ -0,0 +1,13 @@
+build -c fastbuild --enable_platform_specific_config
+build --repo_env=CC=clang++
+
+build:linux --copt="-std=c89" --copt="-Weverything"
+
+build:macos --copt="-std=c89" --copt="-Weverything"
+
+# https://blog.bazel.build/2018/01/19/config-parsing-order.html
+build:opt --config=linux --copt="-03"
+build:opt --config=macos --copt="-03"
+build:opt --config=windows --copt="/GL
+
+build:windows --copt="/std:c11" --copt="/Ze" --copt="/W4" --copt="/WX" # --copt="/Wall"
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2c71732
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+# Bazel
+bazel-*
+
+# Visual Studio Code
+.vscode
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
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+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/WORKSPACE b/WORKSPACE
new file mode 100644
index 0000000..9fbfa3b
--- /dev/null
+++ b/WORKSPACE
@@ -0,0 +1 @@
+workspace(name = "cst120")
diff --git a/cst120/BUILD b/cst120/BUILD
new file mode 100644
index 0000000..fa2d79e
--- /dev/null
+++ b/cst120/BUILD
@@ -0,0 +1,9 @@
+filegroup(
+  name = "build_all",
+  srcs = [
+    "//cst120/week_1:build_all",
+    "//cst120/week_2:build_all",
+    "//cst120/week_3:build_all",
+    "//cst120/week_4:build_all",
+  ],
+)
diff --git a/cst120/week_1/BUILD b/cst120/week_1/BUILD
new file mode 100644
index 0000000..aacb901
--- /dev/null
+++ b/cst120/week_1/BUILD
@@ -0,0 +1,15 @@
+cc_binary(
+  name = "homework_1",
+  srcs = ["homework_1.c"],
+)
+
+cc_binary(
+  name = "quiz_1_program_part",
+  srcs = ["quiz_1_program_part.c"],
+)
+
+filegroup(
+  name = "build_all",
+  srcs = ["homework_1", "quiz_1_program_part"],
+  visibility = ["//visibility:public"],
+)
diff --git a/cst120/week_1/homework_1.c b/cst120/week_1/homework_1.c
new file mode 100644
index 0000000..a29cfa6
--- /dev/null
+++ b/cst120/week_1/homework_1.c
@@ -0,0 +1,92 @@
+/* Assignment: Homework 1
+ * Author:     Zoltan Szabatin
+ * Professor:  Professor Phong Nguyen
+ * Course:     CST 120
+ * Section:    Spring 2023
+ * Standard:   ANSI C
+ * Compiler Infrastructure: LLVM 14.0.0
+ * Compilation Flags: -Weverything -Werror -std=c89
+ * Notes:
+ *   - "safe" functions are unavailable in ANSI C (e.g. `snprintf`, `scanf_s`,
+ *     etc.)
+ *   - Despite what your static analysis tool may say, the format specifiers
+ *     used are 100% correct according to the ANSI C standard. */
+
+/* Disable "safe alternative" warnings when using MSVC */
+/* #ifdef _MSC_VER
+#define _CRT_SECURE_NO_WARNINGS
+#endif */
+
+#include <stdint.h> /* int64_t */
+#include <stdio.h>  /* printf, scanf */
+
+/* Get a positive number from standard input */
+int64_t get_positive_user_input(void);
+
+/* Count the number of digits in a number
+ *
+ * Assumes a radix of 10 */
+int64_t count_digits(int64_t);
+
+int main(void) {
+  /* Predefinition of variables because ANSI C! */
+  int64_t user_number_one = 0;
+  int64_t user_number_two = 0;
+  int64_t product = 0;
+
+  /* Get and store the user's numbers */
+  user_number_one = get_positive_user_input();
+  user_number_two = get_positive_user_input();
+  /* Precalculate the later multiplication operation */
+  product = user_number_one * user_number_two;
+
+  /* Print the sum of the two user numbers */
+  printf("The sum of the two numbers is %lld\n",
+         user_number_one + user_number_two);
+  /* Print the product of the two user numbers */
+  printf("The product of the two numbers is %lld\n", product);
+  /* Print the digit count of the product */
+  printf("The product of the two numbers has %lld digits\n",
+         count_digits(product));
+
+  return 0;
+}
+
+int64_t get_positive_user_input(void) {
+  int64_t user_input = 0;
+
+  /* A funny looking infinite loop that could definitely be achieved with a
+   * "normal" loop */
+  for (;;) {
+    /* Get and store the user's input */
+    printf("Enter a positive number: ");
+    scanf("%llu", &user_input);
+
+    /* If the user's number is positive, return the number; otherwise, ask the
+     * user for another number. */
+    if (user_input >= 0) {
+      break;
+    }
+
+    printf("The number you entered is negative. Enter a positive number.\n");
+  }
+
+  return user_input;
+}
+
+int64_t count_digits(int64_t number) {
+  int64_t count = 0;
+
+  /* Simply counting the number of digits within `number` using a radix of 10
+   *
+   * Ordinarily, I would have used `snprintf(NULL, 0, "%ld", product)`, but
+   * since I'm restricting myself to ANSI C, it has not been implemented yet;
+   * not until C99. */
+  while (number != 0) {
+    number /= 10;
+
+    ++count;
+  }
+
+  return count;
+}
diff --git a/cst120/week_1/quiz_1_program_part.c b/cst120/week_1/quiz_1_program_part.c
new file mode 100644
index 0000000..9848fae
--- /dev/null
+++ b/cst120/week_1/quiz_1_program_part.c
@@ -0,0 +1,62 @@
+/* Assignment: Quiz 1
+ * Author:     Zoltan Szabatin
+ * Professor:  Professor Phong Nguyen
+ * Course:     CST 120
+ * Section:    Spring 2023
+ * Standard:   ANSI C
+ * Compiler Infrastructure: LLVM 14.0.0
+ * Compilation Flags: -Weverything -Werror -std=c89 */
+
+/* Disable "safe alternative" warnings when using MSVC */
+/* #ifdef _MSC_VER
+#define _CRT_SECURE_NO_WARNINGS
+#endif */
+
+#include <stdint.h> /* uint8_t */
+#include <stdio.h>  /* printf, scanf */
+
+int main(void) {
+  uint8_t choice = 3;
+  char continu = 0;
+
+  /* A loop that contains the lifetime of the program, while the user is still
+   * wanting to continue */
+  do {
+    /* A loop which contains the conversion method obtaining; repeats when an
+     * invalid choice is chosen */
+    do {
+      /* Obtain the user's conversion method */
+      printf("Would you like to convert Celsius to Fahrenheit (0) or "
+             "Fahrenheit to "
+             "Celsius (1)? ");
+      scanf("%hhd", &choice);
+
+      if (choice == 0) { /* If the user wants to convert C to F */
+        float celsius = 0.;
+
+        printf("Enter temperature in Celsius: ");
+        scanf("%f", &celsius);
+        printf("%.2f C = %.2f F\n", (double)celsius,
+               (double)(celsius * 9.f / 5.f + 32.f));
+      } else if (choice == 1) { /* If the user want to convert F to C */
+        float fahrenheit = 0.;
+
+        printf("Enter temperature in Fahrenheit: ");
+        scanf("%f", &fahrenheit);
+        printf("%.2f F = %.2f C\n", (double)fahrenheit,
+               (double)((fahrenheit - 32.f) * 5.f / 9.f));
+      } else { /* If the user chose an invalid option */
+        printf("Invalid choice!\n");
+      }
+    } while (choice != 0 && choice != 1); /* Invalid choice lifetime */
+
+    /* Ask the user if they want to go again */
+    printf("Would you like to temperature another temperature? (y/n) ");
+    scanf(" %c", &continu);
+
+    /* "Logic" for continuation */
+    continu = (continu == 'y' || continu == 'Y') ? 1 : 0;
+  } while (continu == 1); /* Continuation lifetime */
+
+  return 0;
+}
diff --git a/cst120/week_2/BUILD b/cst120/week_2/BUILD
new file mode 100644
index 0000000..8ea3568
--- /dev/null
+++ b/cst120/week_2/BUILD
@@ -0,0 +1,20 @@
+cc_binary(
+  name = "homework_2_1",
+  srcs = ["homework_2_1.c"],
+)
+
+cc_binary(
+  name = "homework_2_2",
+  srcs = ["homework_2_2.c"],
+)
+
+cc_binary(
+  name = "quiz_2_program_part",
+  srcs = ["quiz_2_program_part.c"],
+)
+
+filegroup(
+  name = "build_all",
+  srcs = ["homework_2_1", "homework_2_2", "quiz_2_program_part"],
+  visibility = ["//visibility:public"],
+)
diff --git a/cst120/week_2/homework_2_1.c b/cst120/week_2/homework_2_1.c
new file mode 100644
index 0000000..dad8b8b
--- /dev/null
+++ b/cst120/week_2/homework_2_1.c
@@ -0,0 +1,69 @@
+/*
+ * Assignment: Homework 2
+ * Author:     Zoltan Szabatin
+ * Professor:  Professor Phong Nguyen
+ * Course:     CST 120
+ * Section:    Spring 2023
+ * Standard:   ANSI C
+ * Compiler Infrastructure: LLVM 14.0.0
+ * Compilation Flags: -Weverything -Werror -std=c89
+ */
+
+/* #ifdef _MSC_VER
+#define _CRT_SECURE_NO_WARNINGS
+#endif */
+
+#include <stdint.h>
+#include <stdio.h> /* printf */
+
+/* A basic ceiling round implemented for `float`s */
+uint32_t ceil_float(float);
+
+int main(void) {
+  /* Declare and initialise variables */
+  uint32_t actual_test_score = 0;
+  uint32_t possible_test_score = 0;
+  float test_score_percentage = 0.;
+  uint32_t rounded_test_score_percentage = 0;
+  char repeat;
+
+  do {
+    /* Input student's test scores */
+    printf("Actual test score: ");
+    scanf("%u", &actual_test_score);
+    printf("Total points available: ");
+    scanf("%u", &possible_test_score);
+
+    /* Calculate test score percentage and derivatives */
+    test_score_percentage =
+        (float)actual_test_score / (float)possible_test_score * 100;
+    rounded_test_score_percentage = ceil_float(test_score_percentage);
+
+    /* Output the test score percentage and its derivatives */
+    printf("Test score percentage: %.2f%%\n", (double)test_score_percentage);
+    printf("Round test score percentage: %d%%\n",
+           rounded_test_score_percentage);
+
+    /* Output a phrase depending on the rounded test score percentage */
+    if (rounded_test_score_percentage >= 90) {
+      printf("Excellent\n");
+    } else if (rounded_test_score_percentage >= 80) {
+      printf("Bad\n");
+    } else if (rounded_test_score_percentage >= 70) {
+      printf("Catastrophe\n");
+    } else if (rounded_test_score_percentage >= 60) {
+      printf("Death\n");
+    } else {
+      printf("F\n");
+    }
+
+    printf("Would you like to go again? (y/n) ");
+    scanf(" %c", &repeat);
+  } while (repeat == 'y' || repeat == 'Y');
+
+  return 0;
+}
+
+uint32_t ceil_float(float x) {
+  return (x >= 0) ? (uint32_t)(x + 0.5f) : (uint32_t)(x - 0.5f);
+}
diff --git a/cst120/week_2/homework_2_2.c b/cst120/week_2/homework_2_2.c
new file mode 100644
index 0000000..3362aaa
--- /dev/null
+++ b/cst120/week_2/homework_2_2.c
@@ -0,0 +1,107 @@
+/* Assignment: Homework 0
+ * Author:     Zoltan Szabatin
+ * Professor:  Professor Phong Nguyen
+ * Course:     CST 120
+ * Section:    Spring 2023
+ * Standard:   ANSI C
+ * Compiler Infrastructure: LLVM 14.0.0
+ * Compilation Flags: -Weverything -Werror -std=c89 */
+
+/* Disable "safe alternative" warnings when using MSVC */
+/* #ifdef _MSC_VER
+#define _CRT_SECURE_NO_WARNINGS
+#endif */
+
+#include <ctype.h>  /* tolower */
+#include <stdint.h> /* uint16_t */
+#include <stdio.h>  /* printf, stdin, fgets */
+#include <stdlib.h> /* malloc */
+#include <string.h> /* strlen */
+
+/* Check if a input string is a palindrome
+ *
+ * Note: The `bool` extension is native to C99 and beyond. */
+uint8_t is_palindrome(const char *);
+
+/* A small and portable way to flush standard input */
+static void portable_flush(void) {
+  int character;
+
+  /* Usually, checking for a newline should be enough, but this grants
+   * greater coverage. */
+  while ((character = getchar()) != '\n' && character != EOF) {
+  }
+}
+
+int main(void) {
+  /* The maximum size of the user's input */
+  const uint16_t MAX_INPUT = 1024;
+  /* THe user input buffer, pre-allocated to the maximum input size */
+  char *input = (char *)malloc(MAX_INPUT * sizeof(char));
+  char repeat;
+
+  /* Check if the allocation was successful and fail gracefully */
+  if (input == NULL) {
+    printf("An error occurred while getting ready to read input. Please try "
+           "again later.");
+
+    return 1;
+  }
+
+  do {
+    /* Free up the input input buffer, only on multiple runs */
+    memset(input, 0, MAX_INPUT);
+
+    /* Prompt the user for input */
+    printf("Enter a string that you think might be a palindrome: ");
+    /* Get the user's possible palindrome input */
+    fgets(input, MAX_INPUT, stdin);
+
+    /* Clip the trailing newline off */
+    input[strlen(input) - 1] = '\0';
+
+    /* Output the user's possible palindrome to prepare for next step */
+    printf("You entered \"%s\"", input);
+
+    /* Conditionally append a claim to the previous output */
+    if (is_palindrome(input) == 1) {
+      printf(" which IS a palindrome!\n");
+    } else {
+      printf(" which is NOT a palindrome.\n");
+    }
+
+    /* Ask the user if they would like to repeat another operation */
+    printf("Would you like to try another string? (y/n) ");
+    scanf(" %c", &repeat);
+
+    /* Flush standard input, only useful for multiple runs */
+    portable_flush();
+  } while (repeat == 'y' || repeat == 'Y');
+
+  /* Free up the input buffer */
+  free(input);
+
+  return 0;
+}
+
+uint8_t is_palindrome(const char *input) {
+  /* Declare and initialise default variables */
+  size_t start_index = 0;
+  size_t end_index = strlen(input) - 1;
+
+  /* Iterate backwards through the input */
+  while (start_index < end_index) {
+    /* Check if the backwards-indexed character is the same as the current index
+     * character */
+    if (tolower(input[start_index]) != tolower(input[end_index])) {
+      return 0;
+    }
+
+    /* Increment and decrement the indexes to position "cursor" equally on
+     * forwards and backwards indexes */
+    start_index += 1;
+    end_index -= 1;
+  }
+
+  return 1;
+}
diff --git a/cst120/week_2/quiz_2_program_part.c b/cst120/week_2/quiz_2_program_part.c
new file mode 100644
index 0000000..a634f53
--- /dev/null
+++ b/cst120/week_2/quiz_2_program_part.c
@@ -0,0 +1,84 @@
+/*
+ * Assignment: Quiz 2 Written Part
+ * Author:     Zoltan Szabatin
+ * Professor:  Professor Phong Nguyen
+ * Course:     CST 120
+ * Section:    Spring 2023
+ * Standard:   ANSI C
+ * Compiler Infrastructure: LLVM 14.0.0
+ * Compilation Flags: -Weverything -Werror -std=c89
+ * Notes:
+ *   - ...
+ */
+
+/* #ifdef _MSC_VER
+#define _CRT_SECURE_NO_WARNINGS
+#endif */
+
+#include <stdint.h> /* uint8_t */
+#include <stdio.h>  /* printf */
+
+/* I wasn't sure if the operations were supposed to be written from scratch,
+ * but here they are. */
+double square(double);
+
+/* Calculate the factorial of a number */
+double factorial(double);
+
+int main(void) {
+  /* Variable declarations */
+  char repeat;
+  double user_number;
+  double factorial_result;
+  double squared;
+
+  /* Run the program until the user requests a stop */
+  do {
+    /* Ask the user for their input number */
+    printf("Enter a number between 3 and 9: ");
+    scanf("%lf", &user_number);
+
+    /* Calculate the factorial and square of the user's number */
+    factorial_result = factorial(user_number);
+    squared = square(user_number);
+
+    /* Output the operations to the user */
+    printf("%.2f squared is %.2f and the factorial of %.2f is %.2f\n",
+           user_number, squared, user_number, factorial_result);
+
+    /* Custom output if the factorial is less than the squared */
+    if (factorial_result < squared) {
+      printf("Yea! Factorial is less than square!\n");
+    }
+
+    /* Prompt the user to go again */
+    printf("Would you like to repeat the program? (y/n) ");
+    scanf(" %c", &repeat);
+  } while (repeat == 'y' || repeat == 'Y');
+
+  return 0;
+}
+
+double square(double base) {
+  double result = 1.;
+  size_t index = 0;
+
+  /* This isn't quite as optimized as it could be, but it is from scratch. */
+  for (index = 0; index < 2; ++index) {
+    result *= base;
+  }
+
+  return result;
+}
+
+double factorial(double base) {
+  double result = 1.;
+  size_t index = 0;
+
+  /* Non-recursive factorial ... kinda weird */
+  for (index = 2; (double)index <= base; ++index) {
+    result *= (double)index;
+  }
+
+  return result;
+}
diff --git a/cst120/week_3/BUILD b/cst120/week_3/BUILD
new file mode 100644
index 0000000..fcce486
--- /dev/null
+++ b/cst120/week_3/BUILD
@@ -0,0 +1,15 @@
+cc_binary(
+  name = "homework_3",
+  srcs = ["homework_3.c"],
+)
+
+cc_binary(
+  name = "quiz_3_program_part",
+  srcs = ["quiz_3_program_part.c"],
+)
+
+filegroup(
+  name = "build_all",
+  srcs = ["homework_3", "quiz_3_program_part"],
+  visibility = ["//visibility:public"],
+)
diff --git a/cst120/week_3/homework_3.c b/cst120/week_3/homework_3.c
new file mode 100644
index 0000000..ce4f0e3
--- /dev/null
+++ b/cst120/week_3/homework_3.c
@@ -0,0 +1,218 @@
+/* Assignment: Homework 3
+ * Author:     Zoltan Szabatin
+ * Professor:  Professor Phong Nguyen
+ * Course:     CST 120
+ * Section:    Spring 2023
+ * Standard:   ANSI C
+ * Compiler Infrastructure: LLVM 14.0.0
+ * Compilation Flags: -Weverything -Werror -std=c89 */
+
+/* #ifdef _MSC_VER
+#define _CRT_SECURE_NO_WARNINGS
+#endif */
+
+#ifdef _WIN32
+#include <conio.h> /* clrscr */
+#endif
+
+#include <stdint.h> /* int64_t, size_t */
+#include <stdio.h>  /* printf, scanf */
+#include <stdlib.h> /* exit, EXIT_SUCCESS, abs */
+
+/* `bool` doesn't exist yet in C89 ... so if the return value is 0, no error
+ * occurred otherwise, a non-zero value indicates that an error has occurred */
+int safe_input(int64_t *);
+
+/* Print the operations menu */
+void print_menu(void);
+
+/* Handle user input and execution of operations */
+void handle_menu(int64_t *);
+
+/* Clear the terminal screen
+ *
+ * This is pretty portable, but not 100%. Windows is accounted for, but outdated
+ * UNIX systems may not be. */
+static void clear_screen_ansi(void);
+
+/* Print an operations table
+ *
+ * If `is_multiplication` is `1`, then a multiplication table will be printed;
+ * otherwise, an addition table will be printed. */
+void operations_table(int);
+
+/* Count the digits of the input number */
+size_t digit_count(int64_t *);
+
+int main(void) {
+  /* Declare user number with an unattainable placeholder */
+  int64_t user_number = 10000001;
+
+  /* Clear the screen in preparation for menu */
+  clear_screen_ansi();
+
+  /* A funny looking `for` loop that keeps the menu handler going */
+  for (;;) {
+    /* Handle the menu and all operations */
+    handle_menu(&user_number);
+  }
+}
+
+int safe_input(int64_t *number) {
+  /* Prompt and accept input from user */
+  printf("Enter a number: ");
+  scanf("%llu", number);
+
+  /* Make sure that the user's number is within the valid range */
+  if (*number < -1000000 || *number > 1000000) {
+    /* If the number IS invalid, let the user know */
+    clear_screen_ansi();
+    printf("The valid number range is -1000000 to 1000000. Try again!\n\n");
+
+    return 1;
+  }
+
+  return 0;
+}
+
+void print_menu(void) {
+  /* A pretty standard operations menu ... */
+  printf("Available Operations:\n"
+         "  1. Enter number\n"
+         "  2. Print number sign\n"
+         "  3. Print number parity\n"
+         "  4. Print number digit count\n"
+         "  5. Print number addition table\n"
+         "  6. print number multiplication table\n"
+         "  7. Exit\n\n");
+}
+
+void handle_menu(int64_t *user_number) {
+  /* Declare user options */
+  int user_option = 0;
+
+  /* Print the menu */
+  print_menu();
+  /* Prompt the user for a menu option */
+  printf("Enter your option: ");
+  scanf("%d", &user_option);
+  printf("\n");
+
+  /* Handle menu options */
+  switch (user_option) {
+  case 1: {
+    /* Keep accepting input until a valid number is accepted */
+    for (;;) {
+      if (safe_input(user_number) != 0) {
+        continue;
+      }
+
+      break;
+    }
+
+    /* At this point, a valid number has been entered so prepare for next menu
+     * output */
+    clear_screen_ansi();
+  } break;
+  case 2: {
+    /* Output the sign of the user's number */
+    clear_screen_ansi();
+    printf("The number sign is %s.\n\n",
+           *user_number < 0 ? "negative" : "positive");
+  } break;
+  case 3: {
+    /* Output the parity of the user's number */
+    clear_screen_ansi();
+    printf("The number parity is %s.\n\n",
+           *user_number % 2 == 0 ? "even" : "odd");
+  } break;
+  case 4: {
+    /* Output the digit count of the user's number */
+    clear_screen_ansi();
+    printf("The number digit count is %zu.\n\n", digit_count(user_number));
+  } break;
+  case 5: {
+    /* Print an additions table */
+    clear_screen_ansi();
+    operations_table(0);
+  } break;
+  case 6: {
+    /* Print an multiplication table */
+    clear_screen_ansi();
+    operations_table(1);
+  } break;
+  case 7: {
+    /* Give salutations and get out */
+    printf("Goodbye!\n\n");
+    exit(EXIT_SUCCESS);
+  }
+  default: {
+    /* Inform the user that their menu option is invalid */
+    clear_screen_ansi();
+    printf("Invalid menu option. Try again!\n\n");
+  } break;
+  }
+}
+
+static void clear_screen_ansi(void) {
+/* Attempt to make this somewhat portable ... */
+#ifdef _WIN32
+#pragma warning(disable : 4013)
+  /* clrscr(); */
+#pragma warning(default : 4013)
+#else
+#pragma warning(disable : 4129)
+  printf("\e[1;1H\e[2J");
+#pragma warning(default : 4129)
+#endif
+}
+
+size_t digit_count(int64_t *number) {
+  size_t digits = 0;
+  /* A pretty slow but simple `abs` implementation */
+  uint64_t absolute_number = (uint64_t)((*number < 0) ? -*number : *number);
+
+  /* Standard absolute division assuming radix 10 */
+  while (absolute_number != 0) {
+    absolute_number /= 10;
+    digits += 1;
+  }
+
+  return digits;
+}
+
+void operations_table(int is_multiplication) {
+  /* Constant size for the *size* of the multiplications table */
+  const int SIZE = 9;
+  /* Predeclared counter variables because ... C89. */
+  size_t i, j;
+
+  printf("\n   ");
+
+  for (i = 1; i <= SIZE; ++i) {
+    printf("%3llu", i);
+  }
+
+  /* The complete-dash row */
+  printf("\n   ");
+
+  for (i = 1; i <= SIZE; ++i) {
+    printf(" --");
+  }
+
+  printf("\n");
+
+  for (i = 1; i <= SIZE; ++i) {
+    /* Print the root */
+    printf("%zu |", i);
+
+    /* Multiply and print the final value */
+    for (j = 1; j <= SIZE; ++j) {
+      printf("%3llu", is_multiplication ? i * j : i + j);
+    }
+
+    printf("\n");
+  }
+
+  printf("\n");
+}
diff --git a/cst120/week_3/quiz_3_program_part.c b/cst120/week_3/quiz_3_program_part.c
new file mode 100644
index 0000000..b27048d
--- /dev/null
+++ b/cst120/week_3/quiz_3_program_part.c
@@ -0,0 +1,44 @@
+/* Assignment: Quiz 3 Program Part
+ * Author:     Zoltan Szabatin
+ * Professor:  Professor Phong Nguyen
+ * Course:     CST 120
+ * Section:    Spring 2023
+ * Standard:   ANSI C
+ * Compiler Infrastructure: LLVM 14.0.0
+ * Compilation Flags: -Weverything -Werror -std=c89 */
+
+/* #ifdef _MSC_VER
+#define _CRT_SECURE_NO_WARNINGS
+#endif */
+
+#define M_PI 3.14159265358979323846
+/* Inline the calculation of the area given radius */
+#define AREA(radius) (M_PI * radius * radius)
+/* Inline the calculation of the area given radius */
+#define CIRCUMFERENCE(radius) (2 * M_PI * radius)
+
+#include <stdio.h> /* printf, scanf */
+
+int main(void) {
+  /* Store the radius from user */
+  double radius = 0;
+  /* Store the repeat request from user */
+  char user_repeat;
+
+  /* Repeat while the user requests repeat */
+  do {
+    /* Prompt and obtain the radius in meters from user */
+    printf("Enter a radius in meters: ");
+    scanf("%lf", &radius);
+
+    /* Output the circumference and area given the radius */
+    printf("The circumference of that radius is %lf and the area is %lf\n",
+           CIRCUMFERENCE(radius), AREA(radius));
+
+    /* Prompt and obtain choice in repeating program */
+    printf("Would you like to repeat the program? (y/n) ");
+    scanf(" %c", &user_repeat);
+  } while (user_repeat == 'y' || user_repeat == 'Y');
+
+  return 0;
+}
diff --git a/cst120/week_4/BUILD b/cst120/week_4/BUILD
new file mode 100644
index 0000000..7694c5e
--- /dev/null
+++ b/cst120/week_4/BUILD
@@ -0,0 +1,10 @@
+cc_binary(
+  name = "quiz_4_program_part",
+  srcs = ["quiz_4_program_part.c"],
+)
+
+filegroup(
+  name = "build_all",
+  srcs = ["quiz_4_program_part"],
+  visibility = ["//visibility:public"],
+)
diff --git a/cst120/week_4/quiz_4_program_part.c b/cst120/week_4/quiz_4_program_part.c
new file mode 100644
index 0000000..8c4fbf6
--- /dev/null
+++ b/cst120/week_4/quiz_4_program_part.c
@@ -0,0 +1,102 @@
+/* Author: Zoltan Szabatin
+ * Professor: Professor Phong N.
+ * Project: Quiz 4 Program Part
+ * Course: CST 120 */
+
+/* Disable security warnings when using MSVC */
+/* #ifdef _MSC_VER
+#define _CRT_SECURE_NO_WARNINGS
+#endif */
+
+#include <ctype.h> /* islower */
+#include <stdio.h> /* printf, scanf */
+
+/* Known, standard bounds for Caeser cipher */
+#define CAESAR_CIPHER_MESSAGE_SAFETY_BOUND 97
+#define CAESAR_CIPHER_KEY_LOWER_BOUND 0
+#define CAESAR_CIPHER_KEY_UPPER_BOUND 25
+
+/* "String" caster for standard bounds, used for string interpolation in
+ * `printf`s */
+#define CAESER_CIPHER_STRING_INNER(x) #x
+#define CAESER_CIPHER_STRING(x) CAESER_CIPHER_STRING_INNER(x)
+
+/* Obtains a character from the user, through a-z */
+void obtain_character(char *);
+
+/* Obtains a key from the user, through 0-25 */
+void obtain_key(int *);
+
+/* A simple caesar cipher encryptor
+ *
+ * Asserts some assumptions:
+ *   - Only works with lower-case characters
+ *   - Only returns a single upper-case character
+ *   - Assumes the input character array contains a single character
+ *   - A lot more .... but it is more than enough for the assignment */
+char caesar_cipher_encrypt(const char *, const int *);
+
+int main(void) {
+  /* Mutable variables for user input */
+  char user_character = 0;
+  int user_key = 0;
+  char user_go_again = 'z';
+
+  /* Keep running while the user requests so */
+  do {
+    /* Prompt and verify cipher message */
+    printf("Enter a character between a-z: ");
+    obtain_character(&user_character);
+
+    /* Prompt and verify cipher key */
+    printf(
+        "Enter a key, " CAESER_CIPHER_STRING(CAESAR_CIPHER_KEY_LOWER_BOUND) "-" CAESER_CIPHER_STRING(
+            CAESAR_CIPHER_KEY_UPPER_BOUND) ": ");
+    obtain_key(&user_key);
+
+    /* Output final cipher result */
+    printf("%c\n", caesar_cipher_encrypt(&user_character, &user_key));
+
+    /* Prompt user to repeat */
+    printf("Would you like to go again? (y/n) ");
+    scanf(" %c", &user_go_again);
+  } while (user_go_again == 'y' || user_go_again == 'Y');
+
+  return 0;
+}
+
+void obtain_character(char *character) {
+  for (;;) {
+    scanf(" %c", character);
+
+    /* Verify that the character is within the bounds a-z */
+    if (islower(*character) != 0) {
+      return;
+    }
+
+    printf("Do it again, a-z only: ");
+  }
+}
+
+void obtain_key(int *key) {
+  for (;;) {
+    scanf(" %d", key);
+
+    /* Verify that the key sits between the upper and lower bounds */
+    if (*key >= CAESAR_CIPHER_KEY_LOWER_BOUND &&
+        *key <= CAESAR_CIPHER_KEY_UPPER_BOUND) {
+      return;
+    }
+
+    printf(
+        "Do it again, " CAESER_CIPHER_STRING(CAESAR_CIPHER_KEY_LOWER_BOUND) "-" CAESER_CIPHER_STRING(
+            CAESAR_CIPHER_KEY_UPPER_BOUND) " only: ");
+  }
+}
+
+char caesar_cipher_encrypt(const char *message, const int *key) {
+  /* Non-wrapping Caesar cipher encryptor */
+  return (char)toupper(
+      (char)((*message + *key - CAESAR_CIPHER_MESSAGE_SAFETY_BOUND) % 26 +
+             CAESAR_CIPHER_MESSAGE_SAFETY_BOUND));
+}
\ No newline at end of file