labmid.cc

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

using namespace std;

typedef string::iterator strit;
const string charset("0123456789ABCDEF");

class Number {
  string value;
  int base;
  int convToDec (string num, int base);
public:
  Number () {}
  Number (string v, int b) {
    value = v;
    base = b;
  }
  void setValue (string v);
  void setBase (int b);
  string getValue ();
  int getBase();
  string convertToBase(int inputBase);
};

int main (void) {
  Number n1("12", 10), n2;
  n2.setBase(2);
  n2.setValue("1111");

  cout
    << "\t\t" << "Value" << "\t\t" << "Base" << endl
    << "Input\t\t" << n1.getValue() << "\t\t" << n1.getBase() << endl
    << "Output\t\t" << n1.convertToBase(16) << "\t\t" << 16 << endl
    << "\t\t" << "---" << "\t\t" << "---" << endl
    << "Input\t\t" << n2.getValue() << "\t\t" << n2.getBase() << endl
    << "Output\t\t" << n2.convertToBase(8) << "\t\t" << 8 << endl;

  return 0;
}

void Number::setValue (string v) {
  value = v;
}

void Number::setBase (int b) {
  base = b;
}

string Number::getValue () {
  return value;
}

int Number::getBase () {
  return base;
}

int Number::convToDec (string num, int base) {
  int i = num.length(), dec = 0;
  for(strit it = num.begin(); it != num.end(); it++){
    int val = charset.find(*it);
    dec += val * pow(base, --i);
  }
  return dec;
}

string Number::convertToBase (int inputBase) {
  stringstream res;
  int inTen = convToDec(this->value, this->base);
  if (inputBase == 10){
    res << inTen;
    return res.str();
  }
  int temp = inTen;
  while (temp > 0) {
    int r = temp % inputBase;
    res << charset[r];
    temp /= inputBase;
  }
  string t(res.str());
  return string(t.rbegin(), t.rend());
}