Passed by value and passed by reference


#include <iostream>

using namespace std;

void addNumbers(int, int, int&);  

int main ()
{
   int firstNum, secondNum, sum = 0;

   cout << "Enter first number: ";

   cin >> firstNum;

   cout << "Enter second number: ";

   cin >> secondNum;

   addNumbers (firstNum, secondNum, sum);

   cout << firstNum << " + " << secondNum << " = " << sum;

   return 0;
}

void addNumbers (int x, int y, int& z)
{
   z = x + y;
}

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Passed by value and passed by reference : Function Parameters « Function « C++

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