日志
Passing a const
#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;
int result = incr10(num);
cout << endl
<< “incr10(num) = “ << result;
cout << endl
<< “num = “ << num;
result = incr10(value);
cout << endl
<< “incr10(value) = “ << result;
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
}
The output when you execute this is:
Value received = 3
incr10(num) = 13
num = 3
Value received = 6
incr10(value) = 16
value = 6
How It
