C++ Program to Calculate Power of a Number

In this article, you will learn to compute power to a number manually, and by using pow() function.

To understand this example, you should have the knowledge of following C++ programming topics:

This program takes two numbers from the user (a base number and an exponent) and calculates the power.

Power of a number = baseexponent

Example 1: Compute Power Manually

#include <iostream>
using namespace std;

int main()
{
int exponent;
float base, result = 1;

cout << "Enter base and exponent respectively:  ";
cin >> base >> exponent;

cout << base << "^" << exponent << " = ";

while (exponent != 0) {
result *= base;
--exponent;
}

cout << result;

return 0;
}

Output

Enter base and exponent respectively:  3.4
5
3.4^5 = 454.354

The above technique works only if the exponent is a positive integer.

If you need to find the power of a number with any real number as an exponent, you can use pow() function.

Example 2: Compute power using pow() Function

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
float base, exponent, result;

cout << "Enter base and exponent respectively:  ";
cin >> base >> exponent;

result = pow(base, exponent);

cout << base << "^" << exponent << " = " << result;

return 0;
}

Output

Enter base and exponent respectively:  2.3
4.5
2.3^4.5 = 42.44