support up to 6 args, euler

examples/euler14.zr

@@ -0,0 +1,27 @@
+func print_i64[x : I64] : I64
+    printf("%ld\n", x)
+
+func collatz_num[n: I64] : I64
+    if n % 2 == 0
+        return n / 2
+    return n * 3 + 1
+
+func collatz_seq[n: I64]: I64
+    let i: I64 = 1
+    while n != 1
+        n = collatz_num(n)
+        i = i + 1
+    return i
+
+func main[] : I64
+    let max: I64 = 0
+    let max_index: I64 = 0
+
+    let i: I64 = 1
+    while i < 1000000
+        let seq: I64 = collatz_seq(i)
+        if seq > max
+            max = seq
+            max_index = i
+        i = i + 1
+    print_i64(max_index)