Compare pass-by-value and pass-by-reference with references : function definition « Function « C++ Tutorial

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C++ Tutorial » Function » function definition

7.1.5.Compare pass-by-value and pass-by-reference with references

#include <iostream>

using std::cout;

using std::endl;



int byValue( int ); 

void byReference( int & ); 

                                                   

int main()

{

   int x = 2; 

   int z = 4; 



   cout << byValue( x ) << endl;  

   cout << "x = " << x << endl;



   byReference( z );

   cout << "z = " << z << endl;

   return 0;

} 



int byValue( int number )

{

   return number *= number;

}

void byReference( int &numberRef )

{

   numberRef *= numberRef; 

}

4
x = 2
z = 16

7.1.function definition
	7.1.1.	This program contains two functions: main() and f().
	7.1.2.	Define function to add two parameters together
	7.1.3.	The function call stack and activation records
	7.1.4.	Functions that take no arguments.
	7.1.5.	Compare pass-by-value and pass-by-reference with references
	7.1.6.	Default arguments with parameters
	7.1.7.	Definition of function template maximum
	7.1.8.	Functions in an expression: order of evaluation

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