Absolute Value Without abs Programming Challenge

Problem

The absolute value of a number is its distance from zero. Compute it with an if statement instead of a built-in abs function.

Implement absolute_value(n).

n: Any integer.

Return n if it is zero or positive, otherwise -n.

-1,000,000,000 ≤ n ≤ 1,000,000,000

Example 1

Input:
n = -42

Expected output:
expected = 42

Input:
long long n = -42;

Expected output:
long long expected = 42;

Input:
long n = -42;

Expected output:
long expected = 42;

-42 is negative, so the answer is 42.

Example 2

Input:
n = 15

Expected output:
expected = 15

Input:
long long n = 15;

Expected output:
long long expected = 15;

Input:
long n = 15;

Expected output:
long expected = 15;

15 is already positive, so it stays 15.

This challenge is adapted for CodeUtility. Follow the statement and constraints above.