# include<stdio.h> int main(void) { int i,j; double item,sum;/*item和sum为双精度浮点型*/ sum=0;/*对sum初始值赋为0*/ for(i=1;i<=100;i++){/*设置循环,当i<=100时*/ item=1; for(j=1;j<=i;j++) item=item*j; sum=sum+item;/*对sum重新赋值 } printf("1!+2!+...+100!=%e ",sum); return 0; }