题目：求1 + 2!+ 3!+ ... + 20!的和

题目：求1 + 2!+ 3!+ ... + 20!的和

#include<stdio.h>
int main()
{
	int i = 0,j=1,sum=0;
	for (i = 1; i <= 20; i++)
	{
		j = j*i;
		sum = sum + j;
	}
	printf("1+2!+3!+...+20!=%d\n", sum);
	system("pause");
}