02_basic_calculator/05_factorial

Author: woojunro

exercises/02_basic_calculator/05_factorial/src/lib.rs

@@ -9,6 +9,17 @@
 // `factorial(2)` to return `2`, and so on.
 //
 // Use only what you learned! No loops yet, so you'll have to use recursion!
+fn factorial(n: u32) -> u32 {
+  if n == 0 {
+    return 1;
+  }
+
+  if n == 1 {
+    return 1;
+  }
+
+  n * factorial(n - 1)
+}
 
 #[cfg(test)]
 mod tests {