Homework 4 (2)

// series 1 - 2 + 3 - 4 +......

#include <iostream>

 

using namespace std;

// Function to calculate sum

 

int solve_sum(int n)

{

 

// when n is odd

 

if (n % 2 == 1)

 

return (n + 1) / 2;

 

// when n is not odd

 

return -n / 2;

}

// Driver code

 

int main()

{

 

int n = 8;

 

cout << solve_sum(n);

 

return 0;

• }