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Pass By Reference

C++ Functions - Pass By Reference

 

Pass By Reference

In the examples from the previous page, we used normal variables when we passed parameters to a function. You can also pass a to the function. This can be useful when you need to change the value of the arguments:

Example

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

int main() {
  int firstNum = 10;
  int secondNum = 20;

  cout << "Before swap: " << "n";
  cout << firstNum << secondNum << "n";

  // Call the function, which will change the values of firstNum and secondNum
  swapNums(firstNum, secondNum);

  cout << "After swap: " << "n";
  cout << firstNum << secondNum << "n";

  return 0;
}

 

 
Pass By Reference
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