Given a number x, find sum of digits in that number.
Examples:
1. Input n = 8
Output - Sum of digits in number is 8
2. Input n = 1234
Output - Sum of digits in number is 10
3. Input n = - 8
Output - Sum of digits in number is -8
4. Input n = -1234
Output - Sum of digits in number is 8
Step 1: we have to create a demo.html
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| <!DOCTYPE html> | |
| <html> | |
| <body> | |
| <h2>The sum of all digits</h2> | |
| <p>Given a number, the program will return the sum of all its digits (negative digits will count as negative)</p> | |
| <input type="text" value="Input number" id="demo"> | |
| <input type="button" id="btnSum" onclick="mySumFunction()" value="Sum"> | |
| <p id="result"></p> | |
| <input type="text" value="Input number" id="demo1"> | |
| <input type="button" id="btnSum" onclick="mySumFunction1()" value="Sum1"> | |
| <p id="result1"></p> | |
| <script> | |
| function mySumFunction() | |
| { | |
| var num = parseInt(document.getElementById("demo").value); | |
| var sum = 0, remainder = 0; | |
| var offset = false; | |
| if (num < 0) | |
| { | |
| offset = true; | |
| num = num * (-1); | |
| } | |
| while(num) | |
| { | |
| remainder = num % 10; | |
| sum += remainder; | |
| num = (num - remainder) / 10; | |
| } | |
| if (offset) | |
| { | |
| sum = sum - (2 * remainder); | |
| } | |
| document.getElementById("result").innerHTML = sum; | |
| } | |
| function mySumFunction1() | |
| { | |
| var textType = Node.textContent ? 'textContent' : 'innerText'; | |
| var num = parseInt(document.getElementById("demo1").value); | |
| var sum = 0, remainder = 0; | |
| var offset = false; | |
| if (num < 0) | |
| { | |
| offset = true; | |
| num = num * (-1); | |
| } | |
| while(num) | |
| { | |
| remainder = num % 10; | |
| sum += remainder; | |
| num = (num - remainder) / 10; | |
| } | |
| if (offset) | |
| { | |
| sum = sum - (2 * remainder); | |
| } | |
| result1[textType] = sum; | |
| } | |
| </script> | |
| </body> | |
| </html> |
Step 2: we write the function in javascript to sum of all digits in a number. With 2 ways to declare the function.
The first one: using var num = parseInt(document.getElementById("demo").value); when everything is done, we got the sum. We will use document.getElementById("result").innerHTML = sum to show on web browser.
The second one: using var textType = Node.textContent ? 'textContent' : 'innerText'; Is is the textContent or innerText? You also do something like the first one, but when you get the value for <p> tag. Just using like this result1[textType] = sum;
Let's do it now
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