Javascript Question posted in
A very good W3school tutorial can be found here.

JavaScript while loop to print even numbers executes one more time after the condition is false

I have a simple while loop to print even numbers from 0 to 10. I would expect this code to print only up to 10. But it goes up to 12. I can modify the code to check for i<10 instead of i<=10. But I do not understand why the while loop goes on to print 12.

I expect the below code to print up to 10. But it prints up to 12.

let i=0;
while (i<=10){
    console.log(i);
    i+=2;
}
Tags:

2

Answers


  1. 0

    it prints up to 12 because you set the codition i <= 10, i+=2. meaning as long as i is less than or equal to 10, it is going to add 2 to i. so if i is equal to 10, it is still going to add 2 to i. To achieve your desired result, i have update the code, see below:

    let i = 0;
while (i <= 10) {
    i += 2;
    if (i > 10) {
        break;
    }
}
    Login or Signup to reply.
  2. 0

    The code works as expected. It doesn’t print 12.
    Using Code Snippet allows you to verify the code easily.

    let i=0;
while (i<=10){
    console.log(i);
    i+=2;
}
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search