用C语言编写1+1/1!+1/2!+1/3!+...+1/n!

以下是两种C语言编写1+1/1!+1/2!+1/3!+...+1/n!的例子：
1.使用for循环计算前n项

#include <stdio.h>
void main()
{
    int i, n;
    double sum = 1, t = 1;
    printf("输入n:\n");
    scanf("%d", &n);
    for (i = 1; i <= n; i++)
    {
        t = t * i;        sum = sum + 1 / t;
    }
    printf("e=%lf", sum);
}

2.使用for循环计算前n项并输出每一项的和

#include <stdio.h>
int main()
{
    int n;
    float sum = 0;
    printf("请输入一个通项n：\n");
    scanf("%d", &n);
    for (int j = 1; j <= n; j++)
    {
        float t = 1;
        for (int i = 1; i <= j; i++)
        {
            t *= i;
        }
        sum += 1.0 / t;
    }
    printf("1+1/1!+1/2!+1/3!+...+1/n!=%.3f\n", sum);
    return 0;
}