#include
     
      double fact(int n);int main(void){    int i;    double sum;    sum=0;    for(i=1;i<=100;i++)        sum=sum+fact(i);    printf("1!+2!+...+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;}