编辑代码

#include <stdio.h>
main() 
{
    int i,count,j,sum;
    count=1;
    j=1;
    sum=0;
    for(i=1;i<=101;i+=2)
    {
        sum=sum+j*i;
        count=count+1;
        if(count % 2==0) j=-1;
            else j=1;
    }
    printf("%d\n,sum");
}