functions, loops and control flow

loops/src/main.rs

@@ -0,0 +1,17 @@
+fn main() {
+    let fac: i32 = factorial(5);
+    println!("{fac}");
+}
+
+fn factorial(x: i32) -> i32 {
+    let mut rev = x - 1;
+    let mut result = x;
+    loop {
+        result *= rev;
+        rev -= 1;
+
+        if rev == 1 {
+            return result;
+        }
+    }
+}