C program to Find the Power of a Number

January 31, 2023

How to calculate the power of a number in C programming?

A power of a number tells us how many times the number needs to be multiplied with itself. There are various ways to write a C program to Find the Power of a Number, using loops or pre defined functions in C. For calculating you need to have the base and exponent.

C-program-to-find-the-power-of-a-number-image

Syntax:

General code to find the power of a number in C.
while (exp != 0) 
{
        result *= base;
        --exp;
}

Syntax:

General code to find the power of a number in C using pre-defined function in “math.h” library .
double pow(double num1, double num2);
  • num1 – it is the base value.
  • num2 – it is the exponential or power value.

Steps to calculate the power of a number number:

  • Step 1: Start
  • Step 2: Declare the variable num, num2, res.
  • Step 3: Read input num1 and num2 from the user or predefine it according to the need.
  • Step 4: Use the appropriate syntax that you need.
  • Step5: Display the result in the stdout console.
  • Step 6: Program end.
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Working:

In these program we will learn to do the product of two number using various different ways.

Example 1 :

A simple program where we will find the power of a number that is predefined.

Run 
#include<stdio.h>
int main()
{
    int num1=5, num2=5;
    long double result = 1.0;
    while (num2 != 0)
    {
        result *= num1;
        --num2;
    }
    printf("Answer = %.0Lf", result);
    return 0;
}

Output:

Answer = 3125

Example 2 :

Program where we will calculate the power of a numbers given by the users.

Run 
#include<stdio.h>
int main()
{
    int num1, num2;
    long double result = 1.0;
    printf("Enter a base number: ");
    scanf("%d", &num1);
    printf("Enter an exponent: ");
    scanf("%d", &num2);
    while (num2 != 0)
    {
        result *= num1;
        --num2;
    }
    printf("Answer = %.0Lf", result);
    return 0;
}

Input:

Enter a base number: 5
Enter an exponent: 4

Output:

Answer = 625

Example 3 :

Program where we will find the power of a number in C language using pre-functions available in “math.h” library.

Run 
#include<math.h>
#include<stdio.h>
int main()
{
    double num1, num2, result;
    printf("Enter a base number: ");
    scanf("%lf", &num1);
    printf("Enter an exponent: ");
    scanf("%lf", &num2);
    // calculates the power
    result = pow(num1, num2);
    printf("%.1lf^%.1lf = %.2lf", num1, num2, result);
    return 0;
}

Input:

Enter a base number: 4
Enter an exponent: 6

Output:

4.0^6.0 = 4096.00

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