SumOddRange.java

/*********************************************************CODING EXERCISE 14: SUM ODD******************************************************************************
DESCRIPTION EXERCISE: 
Method1: 
  - Write a method called isOdd with an int parameter and call it number. The method needs to return a boolean.

  - Check that number is > 0, if it is not return false.

  - If number is odd return true, otherwise  return false.

Method2: 

  - Write a second method called sumOdd that has 2 int parameters start and end, which represent a range of numbers.

  - The method should use a for loop to sum all odd numbers  in that range including the end and return the sum.

  - It should call the method isOdd to check if each number is odd.

  - The parameter end needs to be greater than or equal to start and both start and end parameters have to be greater than 0.

  - If those conditions are not satisfied return -1 from the method to indicate invalid input. 

TIP: use the remainder operator to check if the number is odd

NOTE: Both methods  needs to be defined as public static like we have been doing so far in the course.
NOTE: Do not add a  main method to solution code.


************************************************************************CODE***************************************************************************************/

public class SumOddRange {
 // Write the code here
 
  public static boolean isOdd(int number) {
        if (number > 0 && number % 2 != 0) {
            return true;
        }
        return false;
    }
 
    public static int sumOdd(int start, int end) {
        if (start < 0 || start > end || end < 0 || end < start) {
            return -1;
 
        }
        int sum = 0;
        for (int n = start; n <= end; n++) {
            if (isOdd(n)) {
                sum += n;
            }
        }
        return sum;
 
    }
}