@@ 0,0 1,44 @@ 
+use std::os;
+
+fn ackermann(m: int, n: int) -> int {
+    if m == 0 {
+        n + 1
+    }
+    else {
+        if n == 0 {
+            ackermann(m - 1, 1)
+        }
+        else {
+            ackermann(m - 1, ackermann(m, n-1))
+        }
+    }
+}
+
+fn main() {
+    let args = os::args();
+    if args.len() < 3 {
+        println!("usage: {} m n", args.get(0));
+        return;
+    };
+
+    let m = match from_str::<int>(args.get(1).as_slice()) {
+        Some(x) => {x}
+        _ => {
+            println!("m must be an integer");
+            return;
+        }
+    };
+
+    let n = match from_str::<int>(args.get(2).as_slice()) {
+        Some(x) => {x}
+        _ => {
+            println!("n must be an integer");
+            return;
+        }
+    };
+
+    let result = ackermann(m, n);
+
+    println!("ackermann({}, {})", m, n);
+    println!("Result: {}", result);
+}