Faye Martin - 3 days ago 5
Java Question

# Java Exercise in While Loop

I badly need help with this exercise.
I'm a newbie in Java and I hope someone could help me.
Here's the question:

Write a program called SumOfSeven to sum those
numbers from 1 to 100 that is divisible by 7. Display
the sum and the average. Use the “while-loop” to

public class Practice {
public static void main(String[] args) {

``````    int counter = 1;
int sum = 0;

while (counter<=100){
while (counter % 7 ==0){
sum+= counter;
}

counter++;
}
System.out.println("The sum is: " + sum);
}
``````

}

I tried executing my answer but the software kept on loading and did not display any answer. I was able to successfully execute the program using this another code I made:

public class SumOfSeven {
public static void main(String[] args) {

``````    int sum = 0;
int counter = 0;

while (counter<=100){
sum+= counter;
counter+=7;
}
System.out.println("The sum is: " + sum);
}
``````

}

I just wanted to know why the first one didn't work.

Best Regards,

Faye

Your inner while loop is infinite (when `counter % 7 == 0`, which is true in the 7th iteration of the outer while loop, when counter reaches 7) and pointless, since you only want to add `counter` to the `sum` one time when it is divisible by 7.

It should be replaced by an if statement :

``````while (counter<=100){
if (counter % 7 ==0) {
sum+= counter;
}

counter++;
}
``````
Source (Stackoverflow)