阶乘的累加

阶乘的累加

#include<stdio.h>
/*
	用while实现 1! + 2! + 3！+... +n! 
*/
int main(){
	int i = 1;
	double  sum = 0;
	while(i<=30){
		double k = 1;
		int j = 1;
		while(j<=i){
			k = k*j;
			j++; 
		}
		sum += k;
		i++;
	}
	printf("sum = %ld", sum);
}