// Ex5_07.cpp
// Using an lvalue reference to modify caller arguments
#include <iostream>
using std::cout;
using std::endl;

int incr10(int& num);                  // Function prototype

int main()
{
  int num {3};
  int value {6};

  int result { incr10(num) };
  cout << endl  << "incr10(num) = " << result
       << endl << "num = " << num;

  result = incr10(value);
  cout << endl << "incr10(value) = " << result
       << endl << "value = " << value << endl;
  return 0;
}

// Function to increment a variable by 10
int incr10(int& num)                   // Function with reference argument
{
  cout << endl << "Value received = " << num;

  num += 10;                           // Increment the caller argument
                                       //  - confidently
  return num;                          // Return the incremented value
}