From c1b6ffe70bd281c6c230fd63fabcaac2aff47514 Mon Sep 17 00:00:00 2001
From: Fuwn <contact@fuwn.me>
Date: Sun, 7 Apr 2024 23:18:32 -0700
Subject: feat: initial commit

---
 chapter1/guess.cxx       | 43 ++++++++++++++++++++++++++++++++
 chapter1/temperature.cxx | 65 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 108 insertions(+)
 create mode 100644 chapter1/guess.cxx
 create mode 100644 chapter1/temperature.cxx

(limited to 'chapter1')

diff --git a/chapter1/guess.cxx b/chapter1/guess.cxx
new file mode 100644
index 0000000..899c3bc
--- /dev/null
+++ b/chapter1/guess.cxx
@@ -0,0 +1,43 @@
+// FILE: guess.cxx
+// Demostrates a guessing game function that's used as a time analysis example.
+
+#include <cassert>         // Provides assert
+#include <iostream>        // Provides cout and cin
+#include <cstdlib>         // Provides EXIT_SUCCESS
+using namespace std;       // Allows all Standard Library items to be used
+
+// Prototype for the function used in this demonstration program
+void guess_game(int n);
+// Precondition: n > 0.
+// Postcondition: The user has been asked to think of a number between 1 and n.
+// The function asks a series of questions, until the number is found.
+
+
+int main( )
+{
+    guess_game(100);
+    return EXIT_SUCCESS;
+}
+
+void guess_game(int n)
+// Library facilities used: cassert, iostream
+{
+    int guess;
+    char answer;
+
+    assert(n >= 1);
+
+    cout << "Think of a whole number from 1 to " << n << "." << endl;
+    answer = 'N';
+    for (guess = n; (guess > 0) && (answer != 'Y') && (answer != 'y'); --guess)
+    {
+        cout << "Is your number " << guess << "?" << endl;
+        cout << "Please answer Y or N, and press return: ";
+        cin >> answer;
+    }
+
+    if ((answer == 'Y') || (answer == 'y'))
+        cout << "I knew it all along." << endl;
+    else
+        cout << "I think you are cheating!" << endl;
+}
diff --git a/chapter1/temperature.cxx b/chapter1/temperature.cxx
new file mode 100644
index 0000000..beeb4b7
--- /dev/null
+++ b/chapter1/temperature.cxx
@@ -0,0 +1,65 @@
+// File: temperature.cxx
+// This program prints a table to convert numbers from one unit to another.
+// The program illustrases some implementation techniques.
+
+#include <iostream>    // Provides cout
+#include <iomanip>     // Provides setw function for setting output width
+#include <cstdlib>     // Provides EXIT_SUCCESS
+#include <cassert>     // Provides assert function
+using namespace std;   // Allows all standard library items to be used
+
+double celsius_to_fahrenheit(double c)
+// Precondition: c is a Celsius temperature no less than absolute
+// zero (-273.16).
+// Postcondition: The return value is the temperature c converted to Fahrenheit
+// degrees.
+{
+    const double MINIMUM_CELSIUS = -273.16; // Absolute zero in Celsius degrees
+    assert(c >= MINIMUM_CELSIUS);
+    return (9.0 / 5.0) * c + 32;  
+}
+
+void setup_cout_fractions(int fraction_digits)
+// Precondition: fraction_digits is not negative.
+// Postcondition: All double or float numbers printed to cout will now be
+// rounded to the specified digits on the right of the decimal.
+{
+    assert(fraction_digits > 0);
+    cout.precision(fraction_digits);
+    cout.setf(ios::fixed, ios::floatfield);
+    if (fraction_digits == 0)
+        cout.unsetf(ios::showpoint);
+    else
+        cout.setf(ios::showpoint); 
+}
+
+int main( )
+{
+    const char   HEADING1[]  = "   Celsius"; // Heading for table's 1st column
+    const char   HEADING2[]  = "Fahrenheit"; // Heading for table's 2nd column
+    const char   LABEL1      =          'C'; // Label for numbers in 1st column
+    const char   LABEL2      =          'F'; // Label for numbers in 2nd column
+    const double TABLE_BEGIN =        -50.0; // The table's first Celsius temp.
+    const double TABLE_END   =         50.0; // The table's final Celsius temp.
+    const double TABLE_STEP  =         10.0; // Increment between temperatures
+    const int    WIDTH       =            9; // Number chars in output numbers
+    const int    DIGITS      =            1; // Number digits right of decimal pt
+
+    double value1;  // A value from the table's first column
+    double value2;  // A value from the table's second column
+    
+    // Set up the output for fractions and print the table headings.
+    setup_cout_fractions(DIGITS);
+    cout << "CONVERSIONS from " << TABLE_BEGIN << " to " << TABLE_END << endl;
+    cout << HEADING1 << "  " << HEADING2 << endl;
+    
+    // Each iteration of the loop prints one line of the table.
+    for (value1 = TABLE_BEGIN; value1 <= TABLE_END; value1 += TABLE_STEP) 
+    {   
+        value2 = celsius_to_fahrenheit(value1);
+        cout << setw(WIDTH) << value1 << LABEL1 << "  "; 
+        cout << setw(WIDTH) << value2 << LABEL2 << endl; 
+    }
+
+    return EXIT_SUCCESS;
+}
-- 
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