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1. Check Strong Number2. Calculate Power of a Number3. Calculate Compound Interest4. Reverse a Number5. Convert Binary to Decimal6. Convert Decimal to Binary7. Convert Octal to Decimal8. Convert Decimal to Octal9. Convert Binary to Octal10. Convert Octal to Binary11. Check Neon Number12. Check Narcissistic Number13. Convert Char to Int

Calculate Power of a Number in C++

Calculate Power of a Number in C++ (6 Programs).

BeginnerAdvanced Number ProgramsExample 2 of 13
calculate-power-of-a-number.cpp
1#include <iostream>
2#include <cmath>
3using namespace std;
4

5int main() {
6    double base, exponent;
7    
8    cout << "Enter base: ";
9    cin >> base;
10    
11    cout << "Enter exponent: ";
12    cin >> exponent;
13    
14    // Method 1: Using pow() function
15    double result = pow(base, exponent);
16    
17    cout << base << " raised to the power " << exponent << " = " << result << endl;
18    
19    return 0;
20}

Output

Enter base: 2
Enter exponent: 8
2 raised to the power 8 = 256

What's going on

This C++ program computes base^exponent with pow from <cmath>. 2^8 is 256.

#include <cmath>

Skip it and pow is an unknown name.

double base, exponent, result;

double so 2.5 and -2 still work. int would truncate 2^(-3).

result = pow(base, exponent);

^ is XOR. 2 ^ 8 is 10, not 256. Don't.

Special cases pow already handles: anything^0 is 1, 2^1 is 2. Fractional exponent 4^0.5 is 2. Negative exponent 2^-3 is 0.125.

A loop result *= base n times only works for a non-negative integer exponent. That's why the library function exists.

Sample: 2 raised to the power 8 = 256.

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