Pow() function belongs to which library in python

In this tutorial, you will learn about the Python pow() method with the help of examples.

The pow() method computes the power of a number by raising the first argument to the second argument

Example

# compute 3^4 
print(pow(3, 4));

# Output:  81

pow() Syntax

The syntax of pow() is:

pow(number, power, modulus [optional])

pow() Parameters

The pow() method takes three parameters:

• number- the base value that is raised to a certain power
• power - the exponent value that raises number
• modulus - (optional) divides the result of number paused to a power and finds the remainder: number^power% modulus

pow() Return Value

The pow() method returns:

• number^power - number, raised to a certain power
• number^power % modulus - with the modulus argument
• 1 - if the value of power is 0
• 0 - if the value of number is 0

Example 1: Python pow()

# returns 2^2
print(pow(2, 2))  

# returns -2^2
print(pow(-2, 2))    

# returns 1/2^2 
print(pow(2, -2))   
 
# returns -1/-2^2 
print(pow(-2, -2))   

Output

4
4
0.25
0.25

The pow() method helps us find the value of a number raised to a certain power.

In the above example,

• pow(2,2) is 22 - results in 4
• pow(-2,2) is -22 - results in -4
• pow(2,-2) is 1/22 - results in 0.25
• pow(-2,-2) is -1/-22 - results in 0.25

Example 2: pow() with Modulus

x = 7
y = 2
z = 5

# compute  x^y % z
print(pow(x, y, z))    

Output

4

In the above example, we have raised the number 7 to the power 2 which results in 49.

Since we have used the pow() method with three arguments x, y, and z, the third argument 5 divides the result of 72 and finds the remainder.

That's why we get the output 4.

Recommended Readings:

• Python id()
• Python int()

The pow() function computes the power of a number.

The pow() function takes two arguments (base value and power value) and, returns the power raised to the base number. For example,

[Mathematics] xy = pow(x, y) [In programming]

The pow() function is defined in math.h header file.

C pow() Prototype

double pow(double x, double y)

The first argument is a base value and second argument is a power raised to the base value.

To find the power of int or a float variable, you can explicitly convert the type to double using cast operator.

int base = 3;
int power = 5;
pow(double(base), double(power));

Example: C pow() function

#include <stdio.h>
#include <math.h>

int main()
{
    double base, power, result;

    printf("Enter the base number: ");
    scanf("%lf", &base);

    printf("Enter the power raised: ");
    scanf("%lf",&power);

    result = pow(base,power);

    printf("%.1lf^%.1lf = %.2lf", base, power, result);

    return 0;
}

Output

Enter the base number: 2.5
Enter the power raised: 3.4
2.5^3.4 = 22.54

❮ Built-in Functions

Example

Return the value of 4 to the power of 3 (same as 4 * 4 * 4):

x = pow(4, 3)

Try it Yourself »

Definition and Usage

The pow() function returns the value of x to the power of y (xy).

If a third parameter is present, it returns x to the power of y, modulus z.

Syntax

Parameter Values

More Examples

Example

Return the value of 4 to the power of 3, modulus 5 (same as (4 * 4 * 4) % 5):

x = pow(4, 3, 5)

Try it Yourself »

❮ Built-in Functions

Description

The C library function double pow(double x, double y) returns x raised to the power of y i.e. xy.

Declaration

Following is the declaration for pow() function.

double pow(double x, double y)

Parameters

• x − This is the floating point base value.

• y − This is the floating point power value.

Return Value

This function returns the result of raising x to the power y.

Example

The following example shows the usage of pow() function.

#include <stdio.h>
#include <math.h>

int main () {
   printf("Value 8.0 ^ 3 = %lf\n", pow(8.0, 3));

   printf("Value 3.05 ^ 1.98 = %lf", pow(3.05, 1.98));
   
   return(0);
}

Let us compile and run the above program that will produce the following result −

Value 8.0 ^ 3 = 512.000000
Value 3.05 ^ 1.98 = 9.097324

math_h.htm

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