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

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C++ » Function » Function Parameters Screenshots  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; }                     Related examples in the same category 1. Function parameters 2. Function: reference version and pointer version 3. Passing Arguments by Value 4. Function uses two arguments 5. Passing Arguments by Reference 6. Passes the variable to be doubled by reference 7. Pass string (char *) into a function 8. Demonstrates the use of return values with reference type. 9. Expressions with reference type exemplified by string assignments.