ex5_08.cpp

来自「Beginning Visual C++ 6源码。Wrox。」· C++ 代码 · 共 38 行

// EX5_08.CPP
// Using a reference to modify caller arguments
#include <iostream>
using namespace std;

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
}