ex5_08.cpp

Visual C++ 2005的源代码

// Ex5_08.cpp
// Using a reference to modify caller arguments
#include <iostream>
using std::cout;
using std::endl;

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

int main(void)
{
   const int num = 3;            // Declared const to test for temporary creation
   int value = 6;

   cout << endl
        << "incr10(num) = " << incr10(num);

   cout << endl
        << "num = " << num;

   cout << endl
        << "incr10(value) = " << incr10(value);

   cout << endl
        << "value = " << value;

   cout << endl;
   return 0;
}

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

//   num += 10;                  // this statement would now be illegal
   return num+10;              // Return the incremented value
}