JavaScript: Test if a number is a Harshad Number or not

JavaScript Math: Exercise-90 with Solution

Write a JavaScript program to check whether a number is a Harshad Number or not.

In recreational mathematics, a harshad number in a given number base, is an integer that is divisible by the sum of its digits when written in that base.
Example: Number 200 is a Harshad Number because the sum of digits 2 and 0 and 0 is 2 (2+0+0) and 200 is divisible by 2. Number 171 is a Harshad Number because the sum of digits 1 and 7 and 1 is 9(1+7+1) and 171 is divisible by 9.

Test Data:
(113) -> false
(171) -> true
(200) -> true

Sample Solution:

JavaScript Code:

``````/**
* Function to check if a number is a Harshad number or not.
* @param {number} n - The number to be checked.
* @returns {boolean} - True if the number is a Harshad number, false otherwise.
*/
function test(n) {
// Convert the number to a string
n = n.toString();
// Initialize the total sum of digits
var total = 0;
// Loop through each digit of the number
for (var i = 0; i < n.length; i++) {
// Add each digit to the total sum
total += parseInt(n[i]);
}
// Convert the number back to an integer
n = parseInt(n);
// Check if the number is divisible by the total sum of its digits
if (n % total === 0) {
// If divisible, return true
return true;
}
// If not divisible, return false
return false;
}

// Test cases
// Test if the number 113 is a Harshad number
n = 113;
console.log("n = " + n);
console.log("Test the said number is Harshad Number or not! " + test(n));

// Test if the number 171 is a Harshad number
n = 171;
console.log("n = " + n);
console.log("Test the said number is Harshad Number or not! " + test(n));

// Test if the number 200 is a Harshad number
n = 200;
console.log("n = " + n);
console.log("Test the said number is Harshad Number or not! " + test(n));
```
```

Output:

```n = 113
Test the said number is Harshad Number or not! false
n = 171
Test the said number is Harshad Number or not! true
n = 200
Test the said number is Harshad Number or not! true
```

Flowchart:

Live Demo:

See the Pen javascript-math-exercise-90 by w3resource (@w3resource) on CodePen.

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