Swap two numbers without using third variable

 

Problem Statement:-  Program to Swap two numbers without using a third variable using functions.

Sample Input/Output:-

Sample Input First: 4 7	Sample Output First:  7 4
Sample Input Second:  123 255	Sample Output Second:  255 123

Data requirement:-

  Input Data:- num1, num2

  Output Data:-num1, num2

Program in C

Here is the source code of the C Program to Swap two numbers without using a third variable using function.

Code:

#include <stdio.h>/*printf,scanf definitions */
/* This function swap two numbers without using third variable*/
void swap_two_numbers(int *num1, int *num2)
{
   *num1 = (*num1) + (*num2);
   *num2 = (*num1) - (*num2);
   *num1 = (*num1) - (*num2);
}
int main()
{
   int num1, num2;
   /* Get the input of two variables */
   printf("Enter the 1st Number:");
   scanf("%d", &num1);
   printf("Enter the 2nd Number:");
   scanf("%d", &num2);
   /* Call Function swap_two_numbers with two Parameters*/
   swap_two_numbers(&num1, &num2);
   /* Display the two numbers after swapping*/
   printf("***After swapping***\n");
   printf("Number 1: %d\nNumber 2: %d\n", num1, num2);
}

Input/Output:

Enter the 1st Number:4

Enter the 2nd Number:7

***After swapping***

Number 1: 7

Number 2: 4

Program in C++

Here is the source code of the C++ Program to Swap two numbers without using a third variable using function.

Code:

#include <iostream>
using namespace std;
/* This function swap two numbers without using third variable*/
void swap_two_numbers(int *num1, int *num2)
{
   *num1 = (*num1) + (*num2);
   *num2 = (*num1) - (*num2);
   *num1 = (*num1) - (*num2);
}
int main()
{
   int num1, num2;
   /* Get the input of two variables */
   cout << "Enter the 1st Number:";
   cin >> num1;
   cout << "Enter the 2nd Number:";
   cin >> num2;
   /* Call Function swap_two_numbers with two Parameters*/
   swap_two_numbers(&num1, &num2);
   /* Display the two numbers after swapping*/
   cout << "***After swapping***\n";
   cout << "Number 1: " << num1 << "\nNumber 2: " << num2;
}

Input/Output:

Enter the 1st Number:123

Enter the 2nd Number:255

***After swapping***

Number 1: 255       

Number 2: 123 

Program in Java

Here is the source code of the Java Program to Swap two numbers without using a third variable using function.

Code:

import java.util.Scanner;
public class SwapTwoNumbersWithoutThird {
    /* This function swap two numbers without using third variable */
    static void SwapTwoNumbers(int num1, int num2) {
        num1 = num1 + num2;
        num2 = num1 - num2;
        num1 = num1 - num2;
        System.out.println("***After Swapping***");
        System.out.println("Number 1:" + num1 + "\nNumber 2:" + num2);
    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        /* Get the input of two variables */
        System.out.println("Enter the 1st Number:");
        int num1 = sc.nextInt();
        System.out.println("Enter the 2nd Number:");
        int num2 = sc.nextInt();
        /* Call Function SwapTwoNumbers with two Parameters */
        SwapTwoNumbers(num1, num2);
        sc.close();
    }
}

Input/Output:

Enter the 1st Number:

52

Enter the 2nd Number:

78

***After Swapping***

Number 1:78

Number 2:52

Program in Python

Here is the source code of the Python Program to Swap two numbers without using a third variable using function.

Code:

""" This function swap two numbers without using third variable """

def swap_two_numbers(num1, num2):
    num1 = num1+num2
    num2 = num1-num2
    num1 = num1-num2
    """ Display the two numbers after swapping """
    print("***After swapping***")
    print("Number 1: ", num1, "\nNumber 2: ", num2)

""" Get the input of two variables """
num1 = int(input("Enter the 1st Number:"))
num2 = int(input("Enter the 2nd Number:"))
""" Call Function swap_two_numbers with two Parameters """
swap_two_numbers(num1, num2)

Input/Output:

Enter the 1st Number:14

Enter the 2nd Number:13

***After swapping***

Number 1:  13       

Number 2:  14 

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