JavaScript: Convert a positive number to negative number

JavaScript Math: Exercise-29 with Solution

Convert Positive Number to Negative

Write a JavaScript function to convert a positive number to a negative number.

Test Data :
console.log(pos_to_neg(15));
-15

Sample Solution:

JavaScript Code:

// Define a function named pos_to_neg that converts a positive number to its negative equivalent.
function pos_to_neg(num)
{
    // Compute the absolute value of num using Math.abs(), then negate it.
    return -Math.abs(num);
}

// Output the result of converting 15 to its negative equivalent to the console.
console.log(pos_to_neg(15));

Output:

-15

Flowchart:

Live Demo:

See the Pen javascript-math-exercise-29 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that converts a positive number to its negative equivalent by multiplying by -1.
• Write a JavaScript function that takes any number and returns its negative absolute value, preserving zero as zero.
• Write a JavaScript function that checks if a number is positive and converts it to negative without using Math.abs.
• Write a JavaScript function that conditionally converts a number to negative only if it is greater than zero.

Improve this sample solution and post your code through Disqus.

Previous: Write a JavaScript function to round up an integer value to the next multiple of 5.
Next: Write a JavaScript function to cast a square root of a number to an integer.