Add for and while loop support (w/o declarations in `for`)

We can now loop and do stuff, yay! However, we don't yet allow
declarations inside the for-loop initializer, since that is a bit
more annoying to implement.

1 files changed, 22 insertions, 0 deletions

diff --git a/examples/loops.cup b/examples/loops.cup
new file mode 100644
index 0000000..6c4f3a7
--- /dev/null
+++ b/examples/loops.cup
@@ -0,0 +1,22 @@
+fn main(): int {
+    let sum1: int = 0;
+    let sum2: int = 0;
+
+    let N: int = 10;
+    let i: int = 0;
+
+    for (i = 0; i <= N; i = i + 1) {
+        sum1 = sum1 + i;
+    }
+
+    i = 0;
+    while (i <= N) {
+        sum2 = sum2 + i;
+        i = i + 1;
+    }
+
+    if (sum1 == sum2 && sum1 == 55) {
+        return 0;
+    }
+    return 1;
+}
\ No newline at end of file