ADD file via upload

main.cpp

@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+int factorial(int n) {
+    int result = 1;
+    for (int i = 1; i <= n; i++) {
+        result *= i;
+    }
+    return result;
+}
+
+int main() {
+    int n;
+    printf("请输入一个非负整数：");
+    scanf("%d", &n);
+    printf("%d! = %d\n", n, factorial(n));
+    return 0;
+}
+