Number System

binary-to-decimal.cc

/*
 *
 */

#include "iostream"
#include "cmath"

class NumberSystem
{
public:
    int binToDac(std::string bin) {
        int dec = 0;

        for (int i = 0; i < bin.length(); i++) {
            dec += int(bin[i] - 48/*'0'*/) * pow(2, bin.size() - i - 1);
        }

        return dec;
    }
};

int main(int argc, char *argv[]) {
    NumberSystem numberSystem;
    std::string bin = "00010101";

    std::cout << "binToDac " << bin << ": " << numberSystem.binToDac(bin) << std::endl;

    bin = "11111111";
    std::cout << "binToDac " << bin << ": " << numberSystem.binToDac(bin) << std::endl;

    bin = "00000000";
    std::cout << "binToDac " << bin << ": " << numberSystem.binToDac(bin) << std::endl;

    return 0;
}

decimal-to-binary.cc

#include "iostream"
#include "vector"

#define IS_EVEN(i) (i & 1) == 1

using namespace std;

class NumberSystem {
public:
    vector<std::string> decToBin(vector<int> dec)
    {
        vector<std::string> bins;

        for (int i = 0; i < dec.size(); i++) {
            std::string bin = "";
            int decimal = dec[i];

            while (decimal > 0) {
                bin = std::to_string(IS_EVEN(decimal)) + bin;
                decimal /= 2;
            }

            bins.push_back(bin);
        }

        return bins;
    }
};

int main()
{
    vector<int> numbers = {8, 64, 255};
    NumberSystem numberSystem;

    vector<std::string> out = numberSystem.decToBin(numbers);

    for (const std::string n: out)
      cout << n << std::endl;

    return 0;
}