计算某个数的阶乘：

 

#include <stdio.h>

 

int factorial(int n) {

    if (n == 0) {

        return 1;

    } else {

        return n * factorial(n - 1);

    }

}

 

int main() {

    int num;

   

    printf("Enter a number: ");

    scanf("%d", &num);

   

    printf("Factorial of %d = %d\n", num, factorial(num));

   

    return 0;

}