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Reference Parameter In C++

Whenever we pass a function of any kind to inside so we can use parameter so that time we have to use address operator so it’s known as reference parameter.

When the actually argument through the variable to pass a value, so that time if we use to define the address operator, so it called reference parameter.  

Fig: Reference Parameter In C++

Syntax:

return type functionname(datatype &variable)

{

function of body;

}

Program:

#include<iostream.h>

#include<conio.h>

void swap(int &i, int &j);

void main()

{

int a,b;

cout<<”input two no”;

cin>>a>>b;

swap(a,b);

cout<<”a=”<<a;

cout<<”b=”<<b;

getch();

}

void swap(int &i, int &j)

{

int k;

k=i;

j=i;

i=k;

}

Output:

Input two no 12

12

a=12, b=12