Write a program to swap two numbers without using a third variable.

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Write a program to swap two numbers without using a third variable.

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You can swap two numbers without using a third variable by using arithmetic operations or the XOR bitwise operator. Here’s a Python program using the arithmetic operations method:

# Program to swap two numbers without using a third variable

# Input: Two numbers
num1 = 5
num2 = 10

print("Before swapping:")
print("num1 =", num1)
print("num2 =", num2)

# Swapping using arithmetic operations
num1 = num1 + num2   # num1 now becomes 15
num2 = num1 - num2   # num2 now becomes 5
num1 = num1 - num2   # num1 now becomes 10

print("After swapping:")
print("num1 =", num1)
print("num2 =", num2)

Explanation:

  1. Initialize num1 and num2 with given values.

  2. Add num2 to num1 and store the result in num1.

  3. Subtract the new num1 (which is num1 + num2) by num2, and store the result in num2.

  4. Subtract the new num1 by the new num2, and store the result in num1.

  5. Print the swapped values.

Output:

Before swapping:
num1 = 5
num2 = 10
After swapping:
num1 = 10
num2 = 5
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