Program To Swap Two Numbers Without Using Temporary Variable

Q. Write an algorithm and program to swap two numbers without using temporary variable.

Solution : We can swap two numbers without using temporary variable. By using + and - operator we can swap two number.

Swapping two number :- Swap two numbers means exchange the values of two variables with each other.
For example:
Before Swapping : num1 = 10 and num2 = 20.
After Swapping : num1 = 20 and num2 = 10.

Swap two numbers without using third variable algorithm

//Algorithm To Swap Two Numbers Without Temporary Variable

START
  Step 1 ->  Take two integer as input num1 and num2.
  Step 2 ->  Print number before swapping
  Step 3 ->  num1 = num1 + num2;
  Step 4 ->  num2 = num1 - num2;
  Step 5 ->  num1 = num1 - num2;
  Step 6 ->  Print numbers after swapping
STOP

Swap Two Numbers Without Using Temporary Variable Program

C++

Java

Python

PHP

//C Program To Swap Two Numbers Without Temporary Variable.

#include <stdio.h>

int main()
{
    int num1,num2;
    printf("Enter Two Numbers :\n");
    scanf("%d %d",&num1,&num2);
    printf("Number before swapping is %d and %d \n",num1,num2);
    num1=num1+num2;
    num2=num1-num2;
    num1=num1-num2;
    printf("Number after swapping is %d and %d \n",num1,num2);

    return 0;
}

//C++ Program To Swap Two Numbers Without Temporary Variable.

#include <iostream>

using namespace std;

int main()
{
    int num1,num2;
    cout<<"Enter Two Numbers :\n";
    cin>>num1>>num2;
    cout<<"Number before swapping is "<<num1<<" and "<<num2<<"\n";
    num1=num1+num2;
    num2=num1-num2;
    num1=num1-num2;
    cout<<"Number after swapping is "<<num1<<" and "<<num2;

    return 0;
}

//Java Program To Swap Two Numbers Without Temporary Variable.

import java.util.Scanner;

public class LFC
{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter Two Numbers :");
        int num1 = scan.nextInt();
        int num2 = scan.nextInt();
        System.out.println("Number before swapping is "+num1+" and "+num2);
        num1=num1+num2;
        num2=num1-num2;
        num1=num1-num2;
        System.out.println("Number after swapping is "+num1+" and "+num2);
    }
}

//Python Program To Swap Two Numbers Without Temporary Variable.
 
print('Enter Two Numbers :')
num1 = int(input())
num2 = int(input()) 
print("Number before swapping is ",num1," and ",num2)
num1 = num1 + num2;
num2 = num1 - num2;
num1 = num1 - num2;
print("Number after swapping is ",num1," and ",num2)

//C# Program To Swap Two Numbers Without Temporary Variable.

using System;
class LFC {
  static void Main() {
    int num1=10,num2=15;
    Console.WriteLine("Number before swapping is "+num1+" and "+num2);
    num1=num1+num2;
    num2=num1-num2;
    num1=num1-num2;
    Console.WriteLine("Number After swapping is "+num1+" and "+num2);

  }
}

//PHP Program To Swap Two Numbers Without Temporary Variable.

<?php
$num1=10;
$num2=20;
echo "Number before swapping is $num1 and $num2 \n";
$num1=$num1+$num2;
$num2=$num1-$num2;
$num1=$num1-$num2;
echo "Number after swapping is $num1 and $num2";
?>

//C Program To Swap Two Numbers Without Temporary Variable.

#include <stdio.h>

int main()
{
    int num1,num2;
    printf("Enter two numers : \n");
    scanf("%d %d",&num1,&num2);
    printf("Number before swapping is %d and %d \n",num1,num2);
    num1=num1+num2;
    num2=num1-num2;
    num1=num1-num2;
    printf("Number after swapping is %d and %d \n",num1,num2);

    return 0;
}

Output

Enter Two Numbers :
10 15
Number before swapping is 10 and 15
Number after swapping is 15 and 10

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