#include<stdio.h>
int main(
void)
{
int denominator,i,n;
double item,sum,flag;
flag=
1;
denominator=
1;
sum=
0;
printf("Enter n:");
scanf("%d",&
n);
for(i=
1;i<=n;i++
){
item=(flag*i)/
denominator;
sum=sum+
item;
flag=-
flag;
denominator=denominator+
2;
}
printf("sum=%.2f\n",sum);
return 0;
}
转载于:https://www.cnblogs.com/liruijia199531/p/3378553.html
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