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#include <iostream>
using namespace std;
 
int squareByValue (int);
int squareByReference (int &);
 
int main() {
	// your code goes here
 
	int x = 2;
	int y = 4;
 
	cout << " x = " << x <<endl;
	cout << " x =  " << squareByValue(x) <<endl;
	cout << " x =  " << x << " after";
 
	cout << " y = " << y << " before ";
	cout << " y = " << squareByReference(y);
	cout << " y " << y << " after ";
 
 
		return 0;
}
 
	int squareByValue (int number)
	{
		return number *= number; 
 
	}
 
	void squareByReference ( int & numberRef )
	{
 
		numberRef *= numberRef;
 
	}
 

prog.cpp: In function 'void squareByReference(int&)':
prog.cpp:31:43: error: ambiguating new declaration of 'void squareByReference(int&)'
  void squareByReference ( int & numberRef )
                                           ^
prog.cpp:5:5: note: old declaration 'int squareByReference(int&)'
 int squareByReference (int &);
     ^

Standard output is empty