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Python program to swap two variables

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robaa
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2022-11-06
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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.

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robaa
2022-11-06
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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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