#includeint fun(int n); int main() { int n; printf("请输入一个整数:"); scanf("%d",&n); printf("S = %d",fun(n)); } int fun(int n) { if(n == 1) return 1; else return n*fun(n-1); }

#includeint fun(int n); int main() { int n; printf("请输入一个整数:"); scanf("%d",&n); printf("S = %d",fun(n)); } int fun(int n) { if(n == 1) return 1; else return n*fun(n-1); }