02_basic_calculator/07_for

Author: woojunro

exercises/02_basic_calculator/07_for/src/lib.rs

@@ -1,6 +1,12 @@
 // Rewrite the factorial function using a `for` loop.
 pub fn factorial(n: u32) -> u32 {
-    todo!()
+    let mut ret: u32 = 1;
+
+    for i in 2..(n + 1) {
+      ret *= i;
+    }
+
+    ret
 }
 
 #[cfg(test)]