10783- Odd Sum.cpp

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,b,c,s,i,j;
    while (scanf("%d",&c)==1)
    {
        for(i=1; i<=c; i++)
        {
            cin>>a>>b;
            s=0;
            if(a%2==0)
            a=a+1;
            for(j=a;j<=b;j=j+2)
            s+=j;
            printf("Case %d: %d\n",i,s);
        }
    }
    return 0;
}