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How to find power of a number in Python?
In this article, we will show you how to find the power of a number in python. Below are the various methods to accomplish this task −
Using for loop
Using Recursion
Using pow() function
Using ** operator
Using for loop
Algorithm (Steps)
Following are the Algorithm/steps to be followed to perform the desired task –.
Create a function findPower() that returns the power of a Number. The function accepts number, and exponent value as parameters.
Take a variable that stores the result and initialize its value with 1.
To obtain the power, multiply the given number by the result exponent. We use the below loop to multiply the exponent number of times
Use the for loop, to traverse in the range 1 to given exponent+1.
Inside the loop, Multiply the result by the given number
Use the return keyword to return the resultant power.
Create 2 separate variables for storing input number and exponent values.
Call the above-defined findPower() function by passing the input number, and exponent values as arguments to it and print the returned result of function.
In the same way, calculating for other numbers
Example
The following program returns the power of a number using the for loop–
# creating a function that returns the power of a Number # It accepts Number, and exponent values as parameters def findPower(number, exponent): # intializing a variable with 1 (it stores the resultant power) resultPower =1 # traversing in the range from 1 to given exponent+1 for i in range(1, exponent+1): # Multiplying the result with the given number resultPower=resultPower*number # returning the resultant power return resultPower # input number, exponent values number = 5 exponent = 3 # calling the findPower() function by passing the number,exponent values # as arguments print("Value of",number,"raised to the power",exponent,"(",number,"^",exponent,") =", findPower(number,exponent)) #, In the same way, calculating for other numbers number = 4 exponent = 0 print("Value of",number,"raised to the power",exponent,"(",number,"^",exponent,") =", findPower(number,exponent))
Output
On executing, the above program will generate the following output −
Value of 5 raised to the power 3 ( 5 ^ 3 ) = 125 Value of 4 raised to the power 0 ( 4 ^ 0 ) = 1
Using Recursion
Algorithm (Steps)
Following are the Algorithm/steps to be followed to perform the desired task –.
Create a function findPower() that returns the power of a Number. The function accepts number, power/exponent value as parameters
Use the if conditional statement, to check whether the exponent value passed is equal to 0.
Return 1 if the condition is true i,e, exponent value is 0.
Subtract the exponent value by 1 and return the resultant power using recursive logic.
Call the above-defined findPower() function by passing the input number, and exponent values as arguments to it and print the returned result of function.
Example
The following program returns the power of a number using the recursive logic –
# creating a function that returns the power of a Number # It accepts Number, power/exponent value as parameters def findPower(number, exponent): # checking whether the exponent value passed is equal to 0 if exponent == 0: # returning 1 if the condition is true return 1 # Subtract the exponent value by 1 and return the resultant power using recursive logic return number * findPower(number, exponent-1) # input number, exponent values number = 5 exponent = 3 # calling the findPower() function by passing the number, exponent values # as arguments print("Value of",number,"raised to the power",exponent,"(",number,"^",exponent,") =", findPower(number,exponent))
Output
On executing, the above program will generate the following output −
Value of 5 raised to the power 3 ( 5 ^ 3 ) = 125
Using pow() function
In Python, the pow() function calculates the power of any positive integer.
It returns the value of x to the power of y (x^y).
Syntax
pow(x,y)
Parameters
x - It is the numerical value (base value)
y - It is the power of numerical value (exponent value)
Algorithm (Steps)
Following are the Algorithm/steps to be followed to perform the desired task –.
Create a variable to store the input number.
Create another variable to store the exponent/power value.
Use the pow() function to print the resultant power of a number i.e, inputNumber ^ inputPower by passing the number, and exponent values as arguments to it and print the resultant power.
Example
The following program returns the power of a number using the pow() function –
# input number inputNumber = 5 # input exponent value inputPower = 3 # printing the resultant power value using the pow() function print("Value of 5 raised to the power 3(5^3)=", pow(inputNumber, inputPower))
Output
On executing, the above program will generate the following output −
Value of 5 raised to the power 3(5^3)= 125
Using ** operator
The exponential operator(**) can be used to calculate the power of a number.
Since importing a module or calling a function is not necessary, this is the most convenient to use.
Algorithm (Steps)
Following are the Algorithm/steps to be followed to perform the desired task –.
Create a variable to store the input number.
Create a variable to store the exponent/power value.
Use the exponential operator(**) to print the resultant power of a number i.e, inputNumber ^ inputPower.
Example
The following program returns the power of a number using the ** operator –
# input number inputNumber = 6 # input exponent value inputPower = 2 # printing the resultant power of a number using exponential operator(**) print("Value of 6 raised to the power 2(6^2)=", inputNumber**inputPower)
Output
On executing, the above program will generate the following output –
Value of 6 raised to the power 2(6^2)= 36
Conclusion
In this article, we learned four different Python methods for calculating the power of a given number and exponent. We also learned how to calculate power without the use of built-in functions.
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