In this tutorial, we are going to learn a python program to calculate the power of a given number without using inbuild python pow function.
Problem Statement
For any two numbers that are inputs given by the user, one is the base value letâs say it as âxâ and the other is the exponent letâs say it as âyâ, we have to print xy.
For example:
Case1: If the user inputs the base of the number as 2 and exponent as 3
                       then the output should be â8â.
Case2: If the user inputs the base of the number as 5 and exponent as 2.
           then the output should be â25â.
While Loop
While Loop in python is used to repeatedly execute a block of statements until a given condition is satisfied. And when the condition becomes false, the block after the loop in the program is executed. While loop falls under the category of indefinite iteration. Indefinite iteration means that the number of times the loop is executed isnât specified explicitly in advance.
Statements represent all the statements indented by the same number of character spaces after a programming construct are considered part of a single block of code. Python uses indentation as its method of grouping statements. When a while loop is executed, expression is first evaluated in a Boolean context, and if it is true, the loop body is executed. Then the expression is rechecked. If it is still valid, the body is executed again, continuing until the expression becomes false.
Letâs have a look at the flow chart of âwhile loopâ

Our Logic to calculate the power
- Our program will take two inputs a base number and an exponent number from the user.
- We will use âwhile loopâ with a condition that exponent number is not equal to 0, if become 0 while execution then our program execution needs to be out from the âwhile loopâ block.
- Inside âwhile loopâ we will multiply exponent with base each time the âwhile loopâ executes and simultaneously we will decrement the value of exponent by 1.
- Once our program came out from the âwhile loopâ, we will print the value as an output of our program.
Python Code to calculate the power
base = int(input("Enter the value for base: "))
exponent = int(input("Enter the value for exponent: "))
result=1;
print(base," to power ",exponent,"=",end = ' ')
#using while loop with a condition that come out of while loop if exponent is 0
while exponent != 0:
result = base * result
exponent-=1
print(result)
Output:
Enter the value for base: 5
Enter the value for exponent: 4
5 to power 4 = 625
Explanation:
For the input from the user, the base number is 5, and the exponent number is 4. The âbase e exponentâ will be 54, which is 5x5x5x5 i.e. 625.
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