Python Program to Swap Two Numbers

In this tutorial we will see two Python programs to swap two numbers. In the first program we are swapping the numbers using temporary variable and in the second program we are swapping without using temporary variable.

Program 1: Swapping two numbers using temporary variable

In this program we are using a temporary variable temp to swap the two numbers. We are storing the value of num1 in temp so that when the value of num1 is overwritten by num2 we have the backup of the num1 value, which we later assign to the num2.

# Program published on https://beginnersbook.com

# Python program to swap two variables

num1 = input('Enter First Number: ')
num2 = input('Enter Second Number: ')

print("Value of num1 before swapping: ", num1)
print("Value of num2 before swapping: ", num2)

# swapping two numbers using temporary variable
temp = num1
num1 = num2
num2 = temp

print("Value of num1 after swapping: ", num1)
print("Value of num2 after swapping: ", num2)

Output:

Enter First Number: 101
Enter Second Number: 99
Value of num1 before swapping:  101
Value of num2 before swapping:  99
Value of num1 after swapping:  99
Value of num2 after swapping:  101

Program 2: Swapping two numbers without using temporary variable

# Program published on https://beginnersbook.com

# Python program to swap two variables

num1 = input('Enter First Number: ')
num2 = input('Enter Second Number: ')

print("Value of num1 before swapping: ", num1)
print("Value of num2 before swapping: ", num2)

# swapping two numbers without using temporary variable
num1, num2 = num2, num1

print("Value of num1 after swapping: ", num1)
print("Value of num2 after swapping: ", num2)

Output:

Enter First Number: 101
Enter Second Number: 999
Value of num1 before swapping:  101
Value of num2 before swapping:  999
Value of num1 after swapping:  999
Value of num2 after swapping:  101

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