C++ to Convert decimal to binary

#include <iostream>
#include <string>
#include <cmath>

int binaryToDecimal(const std::string& binaryStr) {
    int decimalNum = 0;
    int power = 0;

    for (int i = binaryStr.length() - 1; i >= 0; i--) {
        if (binaryStr[i] == '1') {
            decimalNum += static_cast<int>(std::pow(2, power));
        }
        power++;
    }

    return decimalNum;
}

int main() {
    std::string binaryStr;
    
    std::cout << "Enter a binary number: ";
    std::cin >> binaryStr;

    int decimalNum = binaryToDecimal(binaryStr);

    std::cout << "The decimal equivalent of " << binaryStr << " is: " << decimalNum << std::endl;

    return 0;
}