Exercise/8.htm at master · KalariaYash/Exercise · GitHub

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<!-- Write a JavaScript program to find the number of times to replace a given number with the sum of its digits until it converts to a single digit number. -->
<!DOCTYPE html>
<html>

  <head> </head>

  <body>
    <script>
       let number = +prompt( "Enter a number", 0 );
       let tempararyString = "";
       let count = 0;
       let flag = false;
       let stringOfNumber = number.toString();
       if( isNaN(number) ){
           alert("Your entered number is not valid");
       }
       else if (number < 10) {
           alert( "Number of steps required is 0");
       }
       else {

           while( true ) {
               if (stringOfNumber.length % 2 == 0) {
                   count++;
                   console.log(count);
                 for ( let i=0; i<stringOfNumber.length; i += 2) {
                     let temp = parseInt(stringOfNumber.charAt(i)) + parseInt(stringOfNumber.charAt(i+1)) ;
                     tempararyString +=  temp ;
                 }
                 stringOfNumber = tempararyString;
                 tempararyString = "";
                 if ( stringOfNumber.length == 1) {
                        alert( "Number of steps required is " + count);
                        flag = true;
                        break;
                     }
               }
               else {
                   count++;
                for ( let i=0; i<stringOfNumber.length - 1; i += 2) {
                     let temp = parseInt(stringOfNumber.charAt(i)) + parseInt(stringOfNumber.charAt(i+1)) ;
                     tempararyString +=  temp ;
                }
                  tempararyString += stringOfNumber.charAt( stringOfNumber.length - 1);
                  stringOfNumber = tempararyString;
                  tempararyString = "";
                  if ( stringOfNumber.length == 1) {
                        alert( "Number of steps required is " + count);
                        flag = true;
                        break;
                     }

               }
               if ( flag == true ) {
                   break;
               }
           }
       }

    </script>
  </body>

</html>