C++ Binary To Decimal Examples

C++ Binary To Decimal Examples

#include <iostream>
#include <iomanip>
#include <string>
#include <climits>

 
using namespace std;
 
const size_t maxBits = sizeof(short) * CHAR_BIT;
 
int main(int argc, char *argv[]) {
  string line;
  bool inputOk;
  short n;
 
  while (true) {
      cout << "Enter binary number (" << maxBits;
      cout << " bits or less) : " << endl;
      do {
          cout << "> ";
          getline(cin,line);
          inputOk = true;
          for (size_t i = 0; (i < line.size()) && (inputOk == true); i++) {
              if ((line[i] != '0') && (line[i] != '1')) {
                  inputOk = false;
                  cout << "non-bit entered" << endl;
                }
            }
          if ((inputOk == true) && (line.size() > maxBits)) {
              inputOk = false;
              cout << "too big for " << maxBits << "-bit integer" << endl;
            }
        } while (inputOk == false);
 
   
      n = 0;
      for (int i = line.size()-1, j = 0; i >= 0; --i,j++) {
          n |= (line[i] - '0') << j;
        }
      cout << line << " = " << n << endl;
    }
  return 0;
}

Output