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<!DOCTYPE html> <html> <head> <title>Question 1</title> </head> <body> <label>Enter Number:</label> <input type="text" name="number" id="number"> <br> <label>Summation</label> <input type="text" name="result" onclick="sum()" id="result"> <script type="text/javascript"> function sum(){ let digits = document.getElementById('number').value; let number = parseInt(digits); let sum = 0; let rem; while(number!=0){ rem=number%10; sum=sum+rem; number=number/10; } document.getElementById("result").value = sum; } </script> </body> </html>