计算s=1!+2!+……+n!的值

Question

计算s=1!+2!+……+n!的值
救救孩子

Answer 1

# include <stdio.h>
int main()
{
    int i, n;
    double sum = 0, s=1;   
    printf("请您输入n的值：\n");
    scanf("%d", &n);
    for(i=1; i<=n; i++)
    {
        s = s*i;
        sum = sum + s;
    }
    printf("1!+2!+3!+…+n!=%22.15e\n", sum);
    return 0;
}