acm 11473 Campus Roads

#include<stdio.h>
int main()
{
    int a,b,i,t,n,sum;
    while(scanf("%d",&t)!=EOF)
    {
       for(i=1;i<=t;i++)
       {
           sum=0;
           scanf("%d%d",&a,&b);
           for(n=a;n<=b;n++)
           {
               if(n%2!=0)

            sum=sum+n;
           }
           printf("case:%d %d\n",i,sum);
       }

    }
    return 0;
}