Add basic builtin-function support

This isn't really super extendible for now, but it's a start and gives
us the `print` builtin which allows us to finally actually print out
values to the screen, so we can move away from testing with exit codes
eventually.

3 files changed, 34 insertions, 3 deletions

diff --git a/examples/fibonacci.cup b/examples/fibonacci.cup
new file mode 100644
index 0000000..5bf02aa
--- /dev/null
+++ b/examples/fibonacci.cup
@@ -0,0 +1,14 @@
+
+
+fn main() {
+    let a: int = 0;
+    let b: int = 1;
+    let N: int = 20;
+    let i: int ;
+    for (i = 0; i < 20; i = i+1) {
+        print(a);
+        let t: int = a;
+        a = b;
+        b = t + b;
+    }
+}
\ No newline at end of file
diff --git a/examples/hello.cup b/examples/hello.cup
new file mode 100644
index 0000000..eef63eb
--- /dev/null
+++ b/examples/hello.cup
@@ -0,0 +1,17 @@
+
+fn main(): int {
+    putc(72);
+    putc(101);
+    putc(108);
+    putc(108);
+    putc(111);
+    putc(44);
+    putc(32);
+    putc(87);
+    putc(111);
+    putc(114);
+    putc(108);
+    putc(100);
+    putc(33);
+    putc(10);
+}
diff --git a/examples/variables.cup b/examples/variables.cup
index 60a7d6a..83f4982 100644
--- a/examples/variables.cup
+++ b/examples/variables.cup
@@ -1,7 +1,7 @@
 
 
 fn main(): int {
-    let x: int;
-    let y: int;
-    return x;
+    let x: int = 5;
+    let y: int = 6;
+    return x + y;
 }