C++ program to Convert Binary To Decimal




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/**
 * CONVERTING BINARY TO DECIMAL IN C++ codebind.com
 *
 */

#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);

      // Convert string of bits to an integer
      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:
Enter binary number (16 bits or less) :
> 101000
101000 = 40
Enter binary number (16 bits or less) :
> 10
10 = 2
Enter binary number (16 bits or less) :
> 10
10 = 2
Enter binary number (16 bits or less) :
> 101
101 = 5
Enter binary number (16 bits or less) :
>

*/

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