diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..d055824
--- /dev/null
+++ b/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;
+}
+