C++ program to Swap Values using call by reference

What are Functions ?

Function is a block of statements that performs some operations. All C++ programs have at least one function – function called “main()”. This function is entry-point of your program.

A function declaration tells the compiler about a function’s name, return type, and parameters. A function definition provides the actual body of the function.

Defining a Function : :

The general form of a C++ function definition is as follows:

return_type Function_Name( list of parameters )
{
//function’s body
}

• return_type : suggests what the function will return. It can be void, int, char, some pointer or even a class object.
• Function_Name : is the name of the function, using the function name it is called.
• Parameters : are variables to hold values of arguments passed while function is called. A function may or may not contain parameter list.
• Function body : is he part where the code statements are written.

Below is the source code for C++ program to Swap Values using call by reference which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

/* C++ program to Swap Values using call by reference */

#include<iostream>
using namespace std;

void swap(int &,int &);

int main()
{
    int a,b;

    cout<<"\nEnter 1st number :: ";
    cin>>a;
    cout<<"\nEnter 2nd number :: ";
    cin>>b;

    cout<<"\nBefore Swapping :: \n\ta = "<<a<<"\tb = "<<b<<"\n";
    swap(a,b);
    cout<<"\nAfter Swapping :: \n\ta = "<<a<<"\tb = "<<b<<"\n";

    return 0;
}

void swap(int & x,int & y)
{
    int temp;
    temp=x;
    x=y;
    y=temp;
}

OUTPUT : :

/* C++ program to Swap Values using call by reference */

Enter 1st number :: 3

Enter 2nd number :: 9

Before Swapping ::
        a = 3   b = 9

After Swapping ::
        a = 9   b = 3

Process returned 0

Above is the source code for C++ program to Swap Values using call by reference which is successfully compiled and run on Windows System.The Output of the program is shown above .