#include <string>
#include <iostream>

using namespace std;

int calculatePostfixExpression(string expression[], int length);

int main()
{
    string exp[] = {"4", "5", "-"};

    //ASSERT_EQ(calculatePostfixExpression(exp,3), -1);
    if (calculatePostfixExpression(exp,3) != -1)
    {
        cout << "expected/correct value -1, actual value when testing " << calculatePostfixExpression(exp,3) << ".\n";
        return 1;
    }
    return 0;
}