Python program to swap variables without third variable

In this tutorial,we will see without third variable.

1. Swapping two variables using simple built-in method:

left , right = right , left 

x = 15
y = 20

print (“Before swapping: “)
print(“Value of x : “, x, ” and y : “, y)

# code to swap ‘x’ and ‘y’
x, y = y, x

print (“After swapping: “)
print(“Value of x : “, x, ” and y : “, y)

2. Swapping two variables using addition and subtraction:

Syntax:

x = x + y
y = x - y
x = x - y

x=10
y=15

print (“Before swapping: “)
print(“Value of x : “, x, ” and y : “, y)

x = x + y # x = 25, y = 15
y = x - y # x = 25, y = 10 
x = x - y # x = 15, y = 10

print (“After swapping: “)
print(“Value of x : “, x, ” and y : “, y)

3. Swapping two variables using Multiplication and Division

x = x * y 
y = x / y
x = x / y

Example:

x=7
y=9

print (“Before swapping: “)
print(“Value of x : “, x, ” and y : “, y)

x = x * y   # x=63 y=9
y = x / y   # x=63 y=7
x = x / y   # x=9 y=7

print (“After swapping: “)
print(“Value of x : “, x, ” and y : “, y)