ip v2 broadcast calc

#include <iostream>
#include <string>
#include <sstream>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <cstring>

using namespace std;

int BinToDec(const char *binary)
{
    int len, dec = 0, i, exp;

    len = strlen(binary);
    exp = len - 1;

    for (i = 0; i < len; i++, exp--)
        dec += binary[i] == '1' ? pow(2, exp) : 0;
    return dec;
}

string DecToBin(int decimal)
{
    return decimal ==
        0 ? "" : DecToBin(decimal / 2) + ((decimal % 2) ? "1" : "0");
}

int StrToInt(string str)
{
    int i = atoi(str.c_str());
    return i;
}

int Addr[4];
void ConvertFromAddr(string ip)
{
    stringstream s(ip);
    int a, b, c, d;
    char ch;
    s >> a >> ch >> b >> ch >> c >> ch >> d;

    Addr[0] = a;
    Addr[1] = b;
    Addr[2] = c;
    Addr[3] = d;
}

int main()
{
    string ip, mask;
    cin >> ip >> mask;
    // IP start
    ConvertFromAddr(ip); // del dots and array address
    string binIp[4];
    int binIntIp[4];
    for (int i = 0; i<4; i++)
    {
        // fill missing zeros
        int lengthAddr = floor(log10(abs(Addr[i]))) + 1;
        if (lengthAddr<8)
        {
            for (int j=0; j<8-lengthAddr;j++)
                binIp[i] += "0";
        }
        // add binary value of certain 8 bits
        binIp[i] += DecToBin(Addr[i]);
        // convert string to int
        binIntIp[i] = StrToInt(binIp[i]);
    }
    int arrayBinIp[4][8];
    for (int j=0; j<4; j++)
    {
        for (int i = 7; i >= 0; i--)
        {
            // every number goes to its field
            arrayBinIp[j][i] = binIntIp[j] % 10;
            binIntIp[j] /= 10;
        }
    }
    // IP end
    // mask start
    ConvertFromAddr(mask);
    string binMask[4];
    int binIntMask[4];
    for (int i = 0; i<4; i++)
    {
        int lengthAddr = floor(log10(abs(Addr[i]))) + 1;
        if (lengthAddr<8)
        {
            for (int j=0; j<8-lengthAddr;j++)
                binMask[i] += "0";
        }
        binMask[i] += DecToBin(Addr[i]);
        binIntMask[i] = StrToInt(binMask[i]);
    }
    int arrayBinMask[4][8];
    for (int j=0; j<4; j++)
    {
        for (int i = 7; i >= 0; i--)
        {
            arrayBinMask[j][i] = binIntMask[j] % 10;
            binIntMask[j] /= 10;
        }
    }
    // mask end
    // let's compare them...
    for (int i=0;i<4;i++)
    {
     for (int j=0;j<8;j++)
     {
       if (arrayBinMask[i][j]==0)
       {
         // arrayBinIp became the broadcast address
        arrayBinIp[i][j]=1;
       }
     }
    }
    string binBroadcast[4];
    int Broadcast[4];
    for (int i = 0;i<4;i++)
    {
     for (int j =0;j<8; j++)
     {
       binBroadcast[i] += arrayBinIp[i][j]+48;
     }

    char *cstr = new char[binBroadcast[i].length() + 1];
strcpy(cstr, binBroadcast[i].c_str());

  Broadcast[i]=BinToDec(cstr);
    }

    cout << Broadcast[0] << "." <<  Broadcast[1] << "." <<  Broadcast[2] << "." <<  Broadcast[3];
}