10783 Odd Sum

#include<stdio.h>
int main()
{
    int t, i=1, a, b, sum, j;

    scanf("%d", &t);
    while(t--)
    {
         scanf("%d %d", &a, &b);
         sum=0;
         for(j=a;j<=b;j++)
         {
             if(j%2==1)

              sum=sum+j;
         }


              printf("Case %d: %d\n", i, sum);
              i++;



    }




    return 0;
}