#include<stdio.h>
#include<math.h>
main()
{
int flag,i,n;
double item,sum;
printf("Enter n:");
scanf("%d",&
n);
flag=
1;
sum=
0;
for(i=
1;i<=n;i++
){
item=flag*(
1.0/(
3*i-
2));
sum=sum+
item;
flag=-
flag;
}
printf("sum=%.5f\n",sum);
}
转载于:https://www.cnblogs.com/liruijia199531/p/3440910.html
相关资源：OJ平台hustoj
