Program to Convert Binary To Decimal Conversion in C++


Converting Binary to Decimal in C++





#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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