# include <stdio.h>

int main(void)

{

    int val;

    printf("请输入一个数字：");

    printf("val = ");

    scanf("%d", &val);

    for (i=; i<=val; ++i)

    {

        mult = mult * i;

    }

    printf("%d的阶乘是：%d\n", val, mult);

    return ;

}