Question

Given the following JavaScript code, what will be displayed on the web page?

var k=1; var m=0; var p=0;

while (k<=4)

{

     k++;

     for (p=1; p<=4; p++)

     {

           document.write(p +" ");

     }

     document.write("<br>");

}

Answer 1

web page will display

1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4

let use dissect the code

1. var k=1; var m=0; var p=0; // here k is assigned value 1

2. while (k<=4) // this while loop will continue to run when k is less than equal to 4

3. {

4. k++; // each iteration we are incrementing k value by one

5. for (p=1; p<=4; p++) // for that will loop from p = 1 to 4 increment by 1

6. {

7. document.write(p +" "); // print value of p for each p and space after it

8. }

9. document.write("<br>"); // add a line break

10. }

thus inner for loop line(5-8) print a line with values 1 to 4 separated by space as 1 2 3 4

and outer while loop(2-9) runs 4 time printing output of inner for loop line by line