/*计算1！+2！+…+100！。要求定义和调用函数fact(n)计算n的阶乘*/ #include
     
      double fact(int n);int main(void){    int i;    double sum;    sum=0;    for(i=1;i<=100;i++)        sum=sum+fact(i);    /*阶乘相加*/    printf("1!+2!+……+100!=%e\n",sum);    return 0;}double fact(int n)  /*计算n的阶乘*/{    int i;    double result;    result=1;    for(i=1;i<=n;i++)        result=result*i;    return result;}