c语言哪里错了啊编写程序，输入正整数n，计算 1-2/3+3/5-4/7+5/9-6/11+…… 的前n项之和

Question

如题所述

Answer 1

int n,i;
float sum;
scanf("%d",&n);
sum = 1;
for (i = 2; i <=n; i++)
sum += ( (i%2 == 0)?-1:1)*i/(2*i-1);
printf("%f\n", sum);本回答被网友采纳