Page 198 - Web Applications (803) Class 12
P. 198

Output of the preceding program is as follows:























              The do….while loop
              Do-while loop is a variation of the while loop that is available in JavaScript. The main distinction between
              the do-while loop and the while loop is that the former evaluates the condition expression following the
              execution of the code block. The code block will therefore be run at least once during the do...while loop.

              Syntax:

                  do {
                      // Statements to be executed - body of loop
                  } while(condition);
              Flow Diagram:

                                                           do...while loop body






                                                      True         Test
                                                                Condition


                                                                     False

                                                                  Loop
                                                                terminates

              Example:

                  <html>
                  <body text="blue">
                  <h2>Using do...while loop in JavaScript</h2>
                  <font color=green>
                  <script>

                  var num = 5;
                  do {
                     document.write("The Square of "+ num + " is " +(num*num)+"<br> <br>");
                        num=num+1;

                196   Touchpad Web Applications-XII
   193   194   195   196   197   198   199   200   201   202   203