Python swap two Variables

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Python program to swap two variables

In this tutorial, we will learn how to swap two variables in a Python program. Suppose we have two variables, P and Q; We have to write a Python program for swapping their values. We will also discuss the different methods in Python for doing this task.

Method 1: By using Naïve Approach

In this method, the naïve approach will store the value of the P variable in a temporary variable, and then it will assign the variable P with the value of the Q variable. Then, it will assign the value of the temporary variable to the Q variable, which will result in swapping the values of both the variable.

Example:

P = int( input("Please enter value for P: "))
Q = int( input("Please enter value for Q: "))
 
# To swap the value of two variables
# we will user third variable which is a temporary variable
temp_1 = P
P = Q
Q = temp_1
 
print ("The Value of P after swapping: ", P)
print ("The Value of Q after swapping: ", Q)

Output:

Please enter value for P:  13
Please enter value for Q:  43
The Value of P after swapping: 43
The Value of Q after swapping: 13

Method 2: By using comma operator

We can use the comma operator. We do not need to use a third variable for swapping the values of two variables for this method.

Example:

P = int( input("Please enter value for P: "))
Q = int( input("Please enter value for Q: "))
 
# To Swap the values of two variables
P, Q = Q, P
 
print ("The Value of P after swapping: ", P)
print ("The Value of Q after swapping: ", Q)

Output:

Please enter value for P:  12
Please enter value for Q:  43
The Value of P after swapping: 43
The Value of Q after swapping: 12

Method 3: By using XOR method

We can also use the bitwise XOR method for swapping two variables. The XOR of two variables, P and Q, will return the number which has all the bits as 1 whenever the bits of the P and Q variables differ.

Such as XOR of 4 (in binary 0100) and 6 (in binary 0110) is 1010.

XOR of 2 (in binary 0010) and 8 (in binary 1000) is 1010.

Example:

P = int( input("Please enter value for P: "))
Q = int( input("Please enter value for Q: "))
 
# To Swap the values of two variables using XOR
P = P ^ Q
Q = P ^ Q
P = P ^ Q
 
print ("The Value of P after swapping: ", P)
print ("The Value of Q after swapping: ", Q)

Output:

Please enter value for P:  12
Please enter value for Q:  10
The Value of P after swapping: 10
The Value of Q after swapping: 12

Method 4: By using arithmetic operators

In this method, we can swap values of both the variable in two ways:

Using addition and Subtraction operator:

Example:

P = int( input("Please enter value for P: "))
Q = int( input("Please enter value for Q: "))
 
# To Swap the values of two variables using Addition and subtraction operator
P = P + Q  
Q = P - Q 
P = P - Q
 
print ("The Value of P after swapping: ", P)
print ("The Value of Q after swapping: ", Q)

Output:

Please enter value for P:  15
Please enter value for Q:  43
The Value of P after swapping: 43
The Value of Q after swapping: 15

Using multiplication and division operator

Example:

P = int( input("Please enter value for P: "))
Q = int( input("Please enter value for Q: "))
 
# To Swap the values of two variables using Addition and subtraction operator
P = P * Q  
Q = P / Q 
P = P / Q
 
print ("The Value of P after swapping: ", P)
print ("The Value of Q after swapping: ", Q)

Output:

Please enter value for P:  23
Please enter value for Q:  14
The Value of P after swapping: 14.0
The Value of Q after swapping: 23.0

Conclusion

In this tutorial, we have discussed various methods to swap the value of two variables in the Python program.

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Python swap two Variables

Python program to swap two variables

Method 1: By using Naïve Approach

Method 2: By using comma operator

Method 3: By using XOR method

Method 4: By using arithmetic operators

Conclusion

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