https://www.codeeval.com/open_challenge_scores/?pkbid=19

bit_positions.cpp

#define DEBUG 0

#include <iostream>
#include <sstream>
#include <fstream>
#include <stdlib.h>

#if DEBUG
#include <bitset>
#endif

using namespace std;

const string is_bits_same(int n, int p1, int p2) {
    p1--;
    p2--;

    int p1_mask = 1 << p1;
    int p2_mask = 1 << p2;

    int p1_masked_n = n & p1_mask;
    int p2_masked_n = n & p2_mask;

    int b1 = p1_masked_n >> p1;
    int b2 = p2_masked_n >> p2;

#if DEBUG
    cout << "          n: " << bitset<8>(n) << endl;
    cout << "*************" << endl;
    cout << "    p1_mask: " << bitset<8>(p1_mask) << endl;
    cout << "    p2_mask: " << bitset<8>(p2_mask) << endl;
    cout << "*************" << endl;
    cout << "p1_masked_n: " << bitset<8>(p1_masked_n) << endl;
    cout << "p2_masked_n: " << bitset<8>(p2_masked_n) << endl;
    cout << "*************" << endl;
    cout << "         b1: " << bitset<8>(b1) << endl;
    cout << "         b2: " << bitset<8>(b2) << endl;
    cout << "*************" << endl;
    cout << endl;
#endif

    return (b1 == b2) ? "true" : "false";
}

int main(int argc, char *argv[]) {

    ifstream infile(argv[1]);
    string line;

    while (getline(infile, line)) {
        if (line.length() < 1) continue;

        istringstream stream(line);
        string token;

        int params[3] = {0};
        int counter = 0;

        while (getline(stream, token, ',')) {
            params[counter++] = atoi(token.c_str());
        }

        if (sizeof(params) / sizeof(params[0]) != 3) continue;

        cout << is_bits_same(params[0], params[1], params[2]) << endl;
    }

    return 0;
}