Python Program to Swap Two Variables.

Write a Python program that swaps the values of two variables. For example, if a = 5 and b = 10, after swapping, a should be 10 and b should be 5. This simple task is useful in various algorithms and programming scenarios.

There are multiple ways to swap two variables, let's discuss each of them one by one:

Approach 1: Using a Temporary Variable.

The first approach uses a temporary variable to store one of the values, allowing us to perform the swap.

Step-by-step Algorithm:

• Store the value of an in a temporary variable (temp).
• Assign the value of b to a.
• Assign the value of temp to b.

Python Code Implementation.

# Python program to swap two variables using temp variable
# Before swapping
a = 5
b = 10
print(f"Before swapping: a = {a}, b = {b}")

# Swap logic
temp = a
a = b
b = temp

# After swapping
print(f"After swapping: a = {a}, b = {b}")

Output:

Before swapping: a = 5, b = 10
After swapping: a = 10, b = 5

Approach 2: Without Using a Temporary Variable.

The second approach swaps values without using a temporary variable, using arithmetic operations.

Step-by-step Algorithm:

• Add the values of a and b and store the result in a.
• Subtract the original value of a (now stored in b) from a.
• Subtract the original value of b from a to get the original value of a in b.

Python Code Implementation.

# Python program to swap two variables
a = 5
b = 10
print(f"Before swapping: a = {a}, b = {b}")

# Without using a temporary variable
a = a + b
b = a - b
a = a - b

# After swapping
print(f"After swapping: a = {a}, b = {b}")

Output:

Before swapping: a = 5, b = 10
After swapping: a = 10, b = 5

Approach 3: Using Tuple Unpacking.

The third approach leverages the Pythonic way of swapping values using tuple unpacking.

Step-by-step Algorithm:

• Create a tuple with the values of a and b.
• Unpack the tuple into variables a and b.

Python Code Implementation.

# Python program to swap two variables using tuple
a = 5
b = 10
print(f"Before swapping: a = {a}, b = {b}")

# Using tuple unpacking
a, b = b, a

# After swapping
print(f"After swapping: a = {a}, b = {b}")

Output:

Before swapping: a = 5, b = 10
After swapping: a = 10, b = 5

These are a few ways to swap two variables you can choose any method based on your requirements and convenience.

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