计算阶层
2015-04-29 02:40:04 -0400
#include<stdio.h>
void main()
{
float sum=0;
float product=1;
int i;
for(i=1;i<=20;i++)
{
product*=i;
sum+=product;
}
printf("1!+2!+3!+4!+.....+20!=%e\n",sum);
}
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