#C语言 为什么不运行 循环体是哪出错了

Question

#include <stdio.h>
double sum(int n)
{

int i,t;
double s=0;
while(i<=n)
{
    t=-t;
    s+=1./(t*i);
    i=i+2;
}
return s;

}
main()
{
int n;
scanf("%d",&n);
printf("sum=%f\n",sum(n));
}

Answer 1

i定义的时候要初始化为0