Program 1

Write a program to demonstrate the use of call by value and call by reference.

#include<iostream>
using namespace std;

void value(int ,int);
void ref(int &,int &);

int main()
{
int a,b;

cout<<"Enter a & b: ";
cin>>a>>b;

value(a,b);

cout<<"in nain: ";
cout<<"\nA= "<<a<<endl<<"B= "<<b<<endl;

ref(a,b);

cout<<"in nain: ";
cout<<"\nA= "<<a<<endl<<"B= "<<b<<endl;

return 0;
}

void value(int a,int b)
{
int temp;

temp=a;
a=b;
b=temp;

cout<<"in fun call by value: "<<endl;
cout<<"A= "<<a<<endl<<"B= "<<b<<endl;
}

void ref(int &a,int &b)
{
int temp;

temp=a;
a=b;
b=temp;

cout<<endl<<"in fun call by reference: "<<endl;
cout<<"A= "<<a<<endl<<"B= "<<b<<endl;
}

Output :-