UVA10783

Odd Sum

Given a range [a, b], you are to find the summation of all the odd integers in this range. For example, the summation of all the odd integers in the range [3, 9] is 3 + 5 + 7 + 9 = 24.

Input 

There can be at multiple test cases. The first line of input gives you the number of test cases, T ( 1T100). Then T test cases follow. Each test case consists of 2 integers a and b ( 0ab100) in two separate lines.

Output 

For each test case you are to print one line of output - the serial number of the test case followed by the summation of the odd integers in the range [a, b].

Sample Input 

2
1
5
3
5

Sample Output 

Case 1: 9
Case 2: 8

import java.util.Scanner;

public class UVA10783 {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int count = sc.nextInt();

for (int i = 0; i < count; i++) {

int start = sc.nextInt();

int last = sc.nextInt();

int sum = 0;

if (start % 2 == 0)

start++;

for (int j = start; j <= last; j += 2) {

if (j <= last) {

sum += j;

}

}

System.out.println("Case " + (i + 1) + ": " + sum);

}

sc.close();

}

}