How to write code of swap two numbers without using third variable in python

How to write code for swap two numbers without using third variable in python

                           

                              Python problem no:1

BY: DIBYANSHOO PANDEY 

              

                  Python is a simple and object-oriented programming language, there is very simple to define the variable of the problem and describe the points of the problem, and easy to write the algorithm of problem.

Given two-variable a1 and a2. The task is to swap the values of both the variable without using the third variable.

Let's take the two variables and swap both numbers.

For Example: 

                        

                    X: 10

                     Y: 20

After swapping X and Y, We get :

                    X: 20

                    Y: 10
                A: Hello

                 B: World       

After swapping A and B, Wr get:

                A: World

                B: Hello

Method 1: Using the simple built-in method

                      

                            Left = Right

                            Right = Left

     

x = 10

y = 20

print("Before swapping")

print("Value of x is: ",x,"and y",y)

x = y

y = x

print("After swapping")

print("Value of  x is :",x,"and y",y)

Output:

Before swapping

Value of x is:10, and y 20

After swapping 

Value of x is: 20, and y 10

Method 2:Using Adition and Subtraction method 

Take the value of x and y to user

             x = x+y

                   y = x-y

                   x = x-y

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

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

print("Before swapping")

print("Value of x :",x,"and y",y)

x = x+y

y = x-y

x =x-y

print("After swapping")

print("Value of x :",x,"and y",y)

Output:

Enter the value of x 10

Enter the value of y 20

Before swapping

Value of x:  10 and y 20

After swapping 

Value of x: 20 and y 10

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