Python Program to Swap Two Variables

In this article, we have provided a python source code that is capable of swapping the value of two variables. Swapping the value of two variables is a very common and easy coding problem and in every programming language, you can easily make this program.

Prerequisite for Python Program to Swap Two Variables

• Python Input, Output
• Python Data types
• Python Operators

Swap two variables using a temporary variable

Steps

• First, we ask the user to enter the values of both variables a and b.
• Then we store the value of an in temporary value and store the value of b in a.
• At last, we put the value of the temporary variable in b.

Code

a = input("Enter the value of a: ")
b = input("Enter the value of b: ")

#variable swapping logic
temp = a
a=b
b=temp

print("After swapping the value of a has become: ",a)
print("After swapping the value of b has become: ",b)

Input

Enter the value of a: 200
Enter the value of b: 900

Output

Enter the value of a: 200
Enter the value of b: 900
After swapping the value of a has become:  900
After swapping the value of b has become:  200

Swapping the values of two variables without Using a Temporary Variable

In the above example, we have used a temporary variable to swap the values of the variable but python also provides us a technique call tuple unpacking by which we can swap the values of two variables in a single line.

Code

a = input("Enter the value of a: ")
b = input("Enter the value of b: ")

#variable swapping using tuple unpacking
a,b = b,a

print("After swapping the value of a has become: ",a)
print("After swapping the value of b has become: ",b)

Output

Enter the value of a: 132
Enter the value of b: 1900
After swapping the value of a has become:  1900
After swapping the value of b has become:  132

Swap the value of two integer variable without using Addition and Subtraction

Using the logic of Addition and Subtraction we can swap the values of two integer values:

Logic

a = a+b b= a-b a= a-b

Code

a = int(input("Enter the value of a: "))
b = int(input("Enter the value of b: "))

# integer variable swapping using tuple Addition and Subtraction
a = a+b
b = a-b
a = a-b 

print("After swapping the value of a has become: ",a)
print("After swapping the value of b has become: ",b)

Output

Enter the value of a: 100
Enter the value of b: 120
After swapping the value of a has become:  120
After swapping the value of b has become:  100

Apart from addition and subtraction, we can use multiplication and division operator to swap two integer type variables.

Multiplication and Division

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

XOR swap

x = x ^ y
y = x ^ y
x = x ^ y

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