In C++

Write a function that adds all the odd numbers from 1 to n. For example addOdd(9) would return 1+3+5+7+9 = 25. Note if n is even then addOdd(n) will be the same as addOdd(n-1).

Prototype: int addOdd(int n);

The driver used to test your code is below:

int main(){ int n; cin >> n; cout << "n = " << n << endl; cout << "addOdd(" << n << ") = " << addOdd(n) << endl; return 0; }