Question

Write a program in java to enter two
numbers and swap them using third variable.
Board- ICSE
Class- 9​

Answer 1

Answer:

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Answer 2

Answer:

Program to swap two numbers

This program is to swap/exchange two numbers by using a variable.

For example:

Numbers to swap: 11 and 12

Let x= 11, y= 12

Swapping Logic:

t=x= 11

x =y =12

y =t =11

After swapping:

x= 12, y = 11

Algorithm

STEP 1: START

STEP 2: DEFINE x, y, t

STEP 3: ENTER x, y

STEP 4: PRINT x, y

STEP 5: t = x

STEP 6: x= y

STEP 7: y= t

STEP 8: PRINT x, y

STEP 9: END

Java Program

import java.util.*;

class Swap_With {

public static void main(String[] args) {

int x, y, t;// x and y are to swap

Scanner sc = new Scanner(System.in);

System.out.println("Enter the value of X and Y");

x = sc.nextInt();

y = sc.nextInt();

System.out.println("before swapping numbers: "+x +" "+ y);

/*swapping */

t = x;

x = y;

y = t;

System.out.println("After swapping: "+x +" " + y);

System.out.println( );

}

}

Output:

Enter the value of X and Y

2

3

before swapping numbers: 2 3

After swapping: 3 2

C Program

#include <stdio.h>

int main()

{

int x, y, t;// x and y are the swapping variables and t is another variable

printf("Enter the value of X and Y\n");

scanf("%d%d", &x, &y);

printf("before swapping numbers: %d %d\n",x,y);

/*swapping*/

t = x;

x = y;

y = t;

printf("After swapping: %d %d",x,y);

return 0;

}

Output:

Enter the value of X and Y

29

39

before swapping numbers: 29 39

After swapping: 39 29

Python Program

x = int(input("Enter the value of x?"))

y = int(input("Enter the value of y?"))

print("before swapping numbers: %d %d\n" %(x,y))

#swapping#

temp = x

x = y

y = temp

print("After swapping: %d %d\n"%(x,y))

Output:

Enter the value of X? 87

Enter the value of Y? 43

before swapping numbers: 87 43

After swapping: 43 87

PHP Program

<?php

echo "Enter the value of x";

$x = readline();

echo "Enter the value of y";

$y = readline();

echo "before swapping numbers: ";

echo $x;

echo " ";

echo $y;

echo "\n";

/*swapping*/

$temp = $x;

$x = $y;

$y = $temp;

echo "After swapping ";

echo $x;

echo " ";

echo $y;

?>

Output:

Enter the value of x

33

Enter the value of Y

22

before swapping numbers: 33 22

After swapping 22 33

C# Program

using System;

public class Swap

{

public static void Main()

{

Console.WriteLine("Enter the value of x and y");

int x=Convert.ToInt32(Console.ReadLine());

int y = Convert.ToInt32(Console.ReadLine());

int temp;

Console.WriteLine("before swapping numbers: "+x +" "+ y);

/*swapping*/

temp = x;

x = y;

y = temp;

Console.WriteLine("After swapping: "+x +" " + y);

}}

Output:Enter the value of x and y

65

54

before swapping numbers: 65 54

After swapping: 54 65