求小数目的阶乘和一些小数目的阶乘之和

int main()
{
    int a = 0;
    int b = 0;
    int ret = 1;
    scanf("%d", &b);
    for (a = 1; a <= b; a++)
    {
        ret = ret * a;
    }
    printf("%d\n", ret);
    return 0;
}

int main()
{
    int a = 0;
    int b = 0;
    int ret = 1;
    int sum = 0;
    scanf("%d", &b);
    for (a = 1; a <= b; a++)
    {
        ret = ret * a;
        sum = sum + ret;
    }
    printf("%d\n", sum);
    return 0;
}