HTML 7.20 A palindrome is a number or a text phrase that reads the same backward...

HTML

7.20

A palindrome is a number or a text phrase that reads the same backward and forward. For example, each of the following five-digit integers is a palindrome: 12321, 55555, 45554 and 11611. Write a script that reads in a five-digit integer and determines whether it’s a palindrome. If the number is not five digits long, display an alert dialog indicating the problem to the user. Allow the user to enter a new value after dismissing the alert dialog. [Hint: It’s possible to do this exercise with the techniques learned in this chapter. You’ll need to use both division and remainder operations to “pick off” each digit.]

Expert Solution

Palindrome.html:

   <!DOCTYPE html>
   <html>
   <head>
       <meta charset="UTF-8">
       <title>Five Digit Palindrome</title>
       <script type="text/javascript">
           function Palindrome()
           {
               var start = prompt("Please enter a 5 digit string to check whether it is palindrome or not: ",""); //Get the inputted String
               var palindrome = new Array(); //Empty array to write the diffferent palindrome data to..

               while(start.length !=5) //create a loop for checking reelating to the length
               {
                   alert("You didn't enter a 5 digit string! Please enter a 5 digit string!!");
                   start = prompt("Please enter a 5 digit string to check whether it is palindrome or not: ",""); // Ask the user to re-enter the value again
               } //end while

               for(var i=0; i<=start.length-1 ;i++){ //loop to pull off and isolate individual characters
                   palindrome[i] = start.charAt(i); //Add each character to a new array
               };

               //Note that i did not check whether the numbers were numeric...I just checked whether strings are matched or not...!
               if(palindrome[0] == palindrome[4])
               {
                   //check whether first digit equals to the fifth digit.
                   if(palindrome[1] == palindrome[3]) //check whether second digit equals to the fourth digit.
                   {
                       document.write("The number you entered is:"+start+".");
                       document.write("<br> The number "+start+" is a palindrome");
                   }
               }
               else //if 1 does not equals to 5 and 2 doesn't equals to 4, then the string is not a palindrome!
               {
                   document.write("The number you entered is:"+start+".");
                   document.write("<br> The number "+start+" is not a palindrome");
               };

           };   //end of main function
       </script>
   </head>
   <body onload="Palindrome()">
       <h1> Palindrome Finder!</h1>
   </body>
   </html>

Output:

venereology answered 3 months ago

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