RunningNumberMod7Sum.java

//sum all the numbers between 1 to 1000 that are divisible by 7. (Hint: Modify the initialization statement to begin from 7 and post-processing statement to increment by 7. Ans: 71071)
public class RunningNumberMod7Sum {

    public static void main(String[] args) {

        final int LOWERBOUND = 7; // if you need to sum the nuber divisible by any number, change this one!!!
        final int UPPERBOUND = 1000;

        int sum = 0;
        int number = LOWERBOUND;

        while (number <= UPPERBOUND) {
            sum = sum + number;
            number = number + 7; //here also to tell the program how many number from 1 to count!
        }
        System.out.println("The sum of  " + LOWERBOUND + " to " + UPPERBOUND + " is " + sum);

    }
}