# JavaScript: Check if a number is a whole number or has a decimal place

## JavaScript Math: Exercihse-38 with Solution

Write a JavaScript function to check if a number is a whole number or has a decimal place.

Note : Whole Numbers are simply the numbers 0, 1, 2, 3, 4, 5, ... (and so on). No Fractions!

Test Data :

console.log(number_test(25.66));

"Number has a decimal place."

console.log(number_test(10));

"It is a whole number."

**Visual Presentation:**

**Sample Solution:**

**JavaScript Code:**

```
// Define a function named number_test that checks if a number has a decimal place.
function number_test(n)
{
// Calculate the difference between n and its floor value, and check if it is not equal to zero.
var result = (n - Math.floor(n)) !== 0;
// If result is true, return 'Number has a decimal place.'; otherwise, return 'It is a whole number.'
if (result)
return 'Number has a decimal place.';
else
return 'It is a whole number.';
}
// Output the result of testing if 25.66 has a decimal place to the console.
console.log(number_test(25.66));
// Output the result of testing if 10 has a decimal place to the console.
console.log(number_test(10));
```

Output:

Number has a decimal place. It is a whole number.

**Flowchart:**

**Live Demo: **

See the Pen javascript-math-exercise-38 by w3resource (@w3resource) on CodePen.

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