实验5

#include <stdio.h>
double fact(int n);
int main(void)
{
    int n;
    double sum;
    sum=0;
    for(n=1;n<=100;n++)
        sum=sum+fact(n);
    printf("1!+2!+3!+…+100!=%e\n",sum);
    return 0;
}
double fact(int n)
{
    int i;
    double result;
    result=1;
    for(i=1;i<=n;i++)
        result=result*i;
        return result;
}