Pass by Reference vs Pass Value in C++ functions
By: Grant Braught in C++ Tutorials on 2011-01-27
This sample C++ program, demonstrates the difference of Pass by Reference and Pass by Value parameters in C++ functions.
#include <iostream.h>
// Function prototypes...
int Puzzle1(int A, int &B, int &C);
int Puzzle2(int A, int &B, int &C);
int main()
{
int X = 3;
int Y = 2;
int Z = 7;
cout << "Before Puzzles:" << endl;
cout << "X = " << X << endl;
cout << "Y = " << Y << endl;
cout << "Z = " << Z << endl << endl;
X = Puzzle1(X,Y,Z);
cout << "After Puzzle1:" << endl;
cout << "X = " << X << endl;
cout << "Y = " << Y << endl;
cout << "Z = " << Z << endl << endl;
Z = Puzzle2(X,Y,Z);
cout << "After Puzzle2:" << endl;
cout << "X = " << X << endl;
cout << "Y = " << Y << endl;
cout << "Z = " << Z << endl;
return 0;
}
int Puzzle1(int A, int &B, int &C)
{
int D;
C = A;
D = B;
B = A;
A = D;
return D;
}
int Puzzle2(int A, int &B, int &C)
{
int i;
for (i=1; i<=5; i++)
{
B = B + C;
A = A - B;
C++;
}
return C;
} Add Comment
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