USING C LANGUAGE

Write a function that returns the result of a computation given a positive integer nVal.

Given nVal, the function computes for 1 + 2 - 3 + 4 - 5 + ... + nVal

Example:

• If nVal = 4, the function returns the result of 1+ 2 - 3 + 4.
• If nVal = 8, the function returns the result of 1 + 2 - 3 + 4 - 5 + 6 - 7 + 8