CALL BY VALUE

To write a C++ program to swap the given numbers by call by value & address.

ALGORITHM:

Step 1: Start the program.

Step 2: Declare the variables and create the function with normal and pointer variables.

Step 3: Call the appropriate functions.

Step 4: Swap the values and print it.

Step 5: Stop the program.

PROGRAM:

#include<iostream.h>

#include<conio.h>

void swap(int x,int y);

void swap(int*x,int*y);

void main()

{

int a,b;

clrscr();

a=10;

b=20;

cout<<"In main function:\n";

cout<<"a: "<<a<<endl;

cout<<"b: "<<b<<endl;

swap(a,b); //swapping with default arguments

cout<<"In main function:\n";

cout<<"a: "<<a<<endl;

cout<<"b: "<<b<<endl;

swap(&a,&b);//swapping with default arguments

cout<<"In main function:\n";

cout<<"a: "<<a<<endl;

cout<<"b: "<<b<<endl;

getch();

}

void swap(int x ,int y)

{

x=x+y;

y=x-y;

x=x-y;

cout<<endl<<"\t"<<"CALLING FUNCTION 1 "<<endl;

cout<<endl<<"after swapping a is: "<<x<<endl;

cout<<endl<<"after swapping b is: "<<y<<endl;

}

void swap(int *x ,int *y)

{

*x=*x+*y;

*y=*x-*y;

*x=*x-*y;

cout<<endl<<"\t"<<"CALLING FUNCTION 2 "<<endl;

cout<<endl<<" after swapping a is: "<<*x<<endl;

cout<<endl<<" after swapping b is: "<<*y<<endl;

}

OUTPUT:

In main function:

a: 10

b: 20

CALLING FUNCTION 1

after swapping a is: 20

after swapping b is: 10

In main function:

a: 10

b: 20

CALLING FUNCTION 2

after swapping a is: 20

after swapping b is: 10