Why output is not possible here?

Question

I was learning js course and when I see while loop, in this I see a ' try it yourself'
Then I tab and think about this.
https://code.sololearn.com/WkSvevkN1iNs/?ref=app

Answer 1

You're creating two infinite loops.

var i=0;
while (i<=10)
var a=0;

i is always <= 10, so this will keep executing the line "var a=0;".

while (a<=20) {
document.write(i + a + "<br />");
i++;
}

The value of a isn't changed within the loop, so the condition a<=20 will always be true and you've created yet another infinite loop.

To prevent creating an inifinite loop, make sure that your loop has a valid break condition:

var i = 0;

while(i < 10) {
i++;
}

This loop will repeat until i gets >= 10 and then it will stop.

Answer 2

That worked! Thank you all:

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Answer 3

Eknoor Singh Gadria, Ulisses Cruz and Anna, I tried restructuring the loops like this but still couldn't form output in Code Playground. Does the JS have to be linked into the webpage in order to display output?

var i=0;
var a=0;

while (i<10)
{
while (a<20) {
document.write(i + a + "<br>");
a++;
}
i++;
}

Answer 4

Eknoor Singh Gadria you have two infinite loops.
The code is stuck in the first infinite loop.

var i=0;
while (i<=10) // <--- infinite loop (the loop will assign zero to 'a' while i is less or equal to 10, you should update 'i' to avoid this, for example)
var a=0;
while (a<=20) { // <--- infinite loop (you should update 'a' to get out of this loop, for example)
document.write(i + a + "<br />");
i++;
}

Answer 5

boneSpider try closing sololearn, reopen it and try again.