Power Function in C

This article will discuss the power function and its various examples in the C language. The power function is used to find the power of any given number. The power function is a predefined library function of the math.h header file, and we need to import the math.h header file in our program while using the pow() function. In other words, a pow() function is used to calculate the power of the base number (x) by raising the power of (y) as (x^y).

For example, we take base as 2 and power as 5, the power of a number using the pow(2, 5) function to return a value as the 32. Similarly, we pass 3 as the base and 4 as the exponent number to raise the power of the base number using the pow(3, 4), which returns results as 81.

Syntax

The pow() function has two integer arguments for raising the power of base value (x) by the exponent (y).

Parameters:

x: The x variable represents the base value, whose power is to be calculated.
y: The y variable represents the power or exponent value.

Program to find the power of an integer number using the pow() function

Let's consider an example to get the power of an integer number using the pow() function in the C programming language.

Program2.c

#include <stdio.h>
#include <math.h>
int main ()
{
// declare base and exp variable 
int base, exp;
int result; // store the result
printf (" Enter the base value from the user: ");
scanf (" %d", &base); // get base from user
printf (" Enter the power value for raising the power of base: ");
scanf (" %d", &exp); // get exponent from user

// use pow() function to pass the base and the exp value as arguments
result = pow ( base, exp);
printf (" %d to the power of %d is = %d ", base, exp, result);
return 0;
}

Output

Enter the base value from the user: 7
 Enter the power value for raising the power of base: 5
 7 to the power of 5 is = 16807

Program to calculate the power of double data value using the pow() function

Let's consider an example to demonstrate the pow() function using the double data values in the C programming language.

Program2.c

#include <stdio.h>
#include <math.h>
int main ()
{
// declare base and exp variable 
double base, exp;
double result; // store the result
printf (" Enter the base value: ");
scanf (" %lf", &base); // get base from user
printf (" Enter the power value: ");
scanf (" %lf", &exp); // get exponent from user

// use pow() function to pass the base and the exp value as arguments
result = pow ( base, exp);
printf (" %.1lf to the power of %.1lf is = %.2lf ", base, exp, result);
return 0;
}

Output

  Enter the base value from the user: 2.9
 Enter the power value for raising the power of base: 8.3
 2.9 to the power of 8.3 is = 6884.99

Program to get the power of a number using a user-defined function

Let's consider an example to create a user-defined function to get the power of a number in the C programming language.

Program1.c

#include <stdio.h>
#include <math.h>
int main ()
{
	// declare local variable
	long int base, exp;	
	printf (" Enter the base value: ");
	scanf (" %d", &base); // take a number from user
	
	printf (" Enter the power value: ");
	scanf (" %d", &exp); // take a number from user
	
	// use pow() function to pass the base and exp variable
	printf (" %d to the power %d is = %d ", base, exp, pow_num (base, exp));
}

// definition of the function
int pow_num (int x, int y)
{
	int power = 1, i; // declare variables
	for (i = 1; i <= y; ++i)
	{
		power = power * x;
		
	}
	return power;
}

Output

Enter the base value: 25
 Enter the power value: 6
 25 to the power 6 is = 244140625

Program to get the power of a number using the recursion function and pow() function

Let's consider an example to find the power of a number using the recursion function and pow() function in the C programming language.

Program.c

#include <stdio.h>
#include <math.h>
int main ()
{
	// declare local variable
	long int base, exp;	
	printf (" Enter the base value from the user ");
	scanf (" %d", &base); // take a number from user
	
	printf (" Enter the power value from the user ");
	scanf (" %d", &exp); // take a number from user
	
	// use pow() function to pass the base and exp variable
	printf (" %d to the power of %d is = %d ", base, exp, pow_num (base, exp));
}

// definition of the function
int pow_num (int x, int y)
{
	if ( y == 0)
	{
		return 1;
		}	
	else
		return pow_num (x, y - 1) * x;	
}

Output

Enter the base value from the user 5
 Enter the power value from the user 6
 5 to the power of 6 is = 15625

Conclusion

A power function is used to find the power of any numeric data (int, float, double) using the pow() function. A power function has two arguments: the base number and the exponent number. The base number represents the power to be calculated, and the exponent defines the power of the base value.

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