pow() in Python

Python offers to compute the power of a number and hence can make task of calculating power of a number easier. It has many-fold applications in day to day programming.

Naive Method to compute power :

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# Python code to demonstrate naive method
# to compute power 
n = 1
for i in range(1,5):
    n=3*n
  
print ("The value of 3**4 is : ",end="")
print (n)

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Output :

The value of 3**4 is : 81
Using pow()

1. float pow(x,y) : This function computes x**y. This function first converts its arguments into float and then computes the power.

Declaration : 
float pow(x,y)
Parameters : 
x : Number whose power has to be calculated.
y : Value raised to compute power.
Return Value : 
Returns the value x**y in float.
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# Python code to demonstrate pow()
# version 1
  
print ("The value of 3**4 is : ",end="")
  
# Returns 81
print (pow(3,4))

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Output :

The value of 3**4 is : 81.0

2. float pow(x,y,mod) : This function computes (x**y) % mod. This function first converts its arguments into float and then computes the power.

Declaration : 
float pow(x,y,mod)
Parameters : 
x : Number whose power has to be calculated.
y : Value raised to compute power.
mod :  Value with which modulus has to be computed.
Return Value : 
Returns the value (x**y) % mod in float.
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# Python code to demonstrate pow()
# version 2
  
print ("The value of (3**4) % 10 is : ",end="")
  
# Returns 81%10
# Returns 1
print (pow(3,4,10))

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Output :

The value of (3**4) % 10 is : 1

Implementation Cases in pow() :

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# Python code to discuss negative
# and non-negative cases
  
# positive x, positive y (x**y)
print("Positive x and positive y : ",end="")
print(pow(4, 3))
  
print("Negative x and positive y : ",end="")
# negative x, positive y (-x**y)
print(pow(-4, 3))
  
print("Positive x and negative y : ",end="")
# positive x, negative y (x**-y)
print(pow(4, -3))
  
print("Negative x and negative y : ",end="")
# negative x, negative y (-x**-y)
print(pow(-4, -3))

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Output:

Positive x and positive y : 64
Negative x and positive y : -64
Positive x and negative y : 0.015625
Negative x and negative y : -0.015625

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