Python Program - Power of a Number


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If power (or exponential) of number indicates how many the number is multiplied by itself to get the final number. For example:

$$x$$ raised to the power $$2$$ = $$x^2 = x*x$$

$$x$$ raised to the power $$3$$ = $$x^3 = x*x*x$$

Example: Using conditional statement

In the below example, a function called Power() is created to calculate power of a number. It uses while loop to achieve this. This method can be used to calculate the power of a number where power should be a non-negative integer.

def Power(x, n):
  finalnum = 1
  n1 = n
  while(n1 > 0):
    finalnum = finalnum * x
    n1 = n1 - 1
  print(x, "raised to the power", n, "=", finalnum)

Power(3, 5)
Power(5, 0)
Power(6, 2)

Output

3 raised to the power 5 = 243
5 raised to the power 0 = 1
6 raised to the power 2 = 36

Example: Using exponential (**) operator

The exponential (**) operator of Python can be used to calculate the power of a number. Please see the below example for syntax. It can be used to calculate $$x^n$$ for any value of n (n can be negative or fraction).

x, y, z = 3, 5, 6
a, b, c = 5, 0, 2

print(x, "raised to the power", a, "=", x**a)
print(y, "raised to the power", b, "=", y**b)
print(z, "raised to the power", c, "=", z**c)

Output

3 raised to the power 5 = 243
5 raised to the power 0 = 1
6 raised to the power 2 = 36

Example: Using pow() method of math Module

The pow() method of math module can also be used to calculate power of a number. It can be used to calculate $$x^n$$ for any value of n (n can be negative or fraction).

import math

x, y, z = 3, 5, 6
a, b, c = 5, 0, 2

print(x, "raised to the power", a, "=", math.pow(x,a))
print(y, "raised to the power", b, "=", math.pow(y,b))
print(z, "raised to the power", c, "=", math.pow(z,c))

Output

3 raised to the power 5 = 243
5 raised to the power 0 = 1
6 raised to the power 2 = 36

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