C++ Program to Calculate the Power of a Number

In this post, we will learn how to calculate the power of a number using C++ Programming language.

An expression that represents repeated multiplication of the same factor is called a power. For example: the power of a base5‘ of exponent2‘ is 52 = 5 x 5 = 25.

We will calculate the power of a number using the following approaches:

  1. Using pow() function
  2. Using While Loop

So, without further ado, let’s begin this tutorial.

C++ Program to Calculate the Power of a Number

// C++ Program to Calculate the Power of a Number
#include <iostream>
#include <cmath>
using namespace std;

int main(){
    float base, exp, power;
    
    // Asking for input
    cout << "Enter the base: ";
    cin >> base;
    cout << "Enter the exponent: ";
    cin >> exp;
    
    // Calculating power using pow() function
    power = pow(base, exp);
    
    // Displaying output
    cout << base <<  "^" << exp << " = " << power << endl;
    return 0;
}

Output

Enter the base: 2
Enter the exponent: 5
2^5 = 32

How Does This Program Work ?

    float base, exp, power;

In this program, we have declared three floating data type variables named base, exp and power.

    // Asking for input
    cout << "Enter the base: ";
    cin >> base;
    cout << "Enter the exponent: ";
    cin >> exp;

Now, the user is asked to enter the base and exponent.  

    // Calculating power using pow() function
    power = pow(base, exp);

The power of the entered number is calculated using the pow() function. The pow() function computes a base number raised to the power of an exponent. This function is located in the cmath header file.

The power of the number gets stored in the power named variable.

    // Displaying output
    cout << base <<  "^" << exp << " = " << power << endl;

The power of the entered number is displayed on the screen using the cout statement.

C++ Program to Calculate the Power of a Number Using For Loop

// C++ Program to Calculate the Power of a Number Using For Loop
#include <iostream>
using namespace std;

int main(){
    float base, exp, power = 1;
    
    // Asking for input
    cout << "Enter the base: ";
    cin >> base;
    cout << "Enter the exponent: ";
    cin >> exp;
    
    // Calculating power
    for (int i = 0; i < exp; i++){
        power = power * base;
    }
    
    // Displaying output
    cout << base << "^" << exp << " = " << power << endl;
    return 0;
}

Output

Enter the base: 3
Enter the exponent: 3
3^3 = 27

Conclusion

I hope after going through this post, you understand how to calculate the power of a number using C++ Programming language.

If you have any doubt regarding the post, then contact us in the comment section. We will be delighted to assist you.

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