Python Program to Swap Two Variables
Given two variables x and y, write a Python program to swap their values. Let’s see different methods in Python to do this task.
Method 1: Using Naive approach
The most naive approach is to store the value of one variable(say x) in a temporary variable, then assigning the variable x with the value of variable y. Finally, assign the variable y with the value of the temporary variable.
# Python program to demonstrate # swapping of two variables x = 10y = 50 # Swapping of two variables # Using third variable temp = x x = y y = temp print("Value of x:", x) print("Value of y:", y) |
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Output:
Value of x: 50 Value of y: 10
Method 2: Using comma operator
Using the comma operator the value of variables can be swapped without using a third variable.
# Python program to demonstrate # swapping of two variables x = 10y = 50 # Swapping of two variables # without using third variable x, y = y, x print("Value of x:", x) print("Value of y:", y) |
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Output:
Value of x: 50 Value of y: 10
Method 3: Using XOR
The bitwise XOR operator can be used to swap two variables. The XOR of two numbers x and y returns a number which has all the bits as 1 wherever bits of x and y differ. For example XOR of 10 (In Binary 1010) and 5 (In Binary 0101) is 1111 and XOR of 7 (0111) and 5 (0101) is (0010).
# Python program to demonstrate # Swapping of two variables x = 10y = 50 # Swapping using xor x = x ^ y y = x ^ y x = x ^ y print("Value of x:", x) print("Value of y:", y) |
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Output:
Value of x: 50 Value of y: 10
Method 4: Using arithmetic operators
The idea is to get sum in one of the two given numbers. The numbers can then be swapped using the sum and subtraction from sum.
# Python program to demonstrate # swapping of two variables x = 10y = 50 # Swapping of two variables # using arithmetic operations x = x + y y = x - y x = x - y print("Value of x:", x) print("Value of y:", y) |
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Output:
Value of x: 50 Value of y: 10
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