[C++] break into nibbles, use std::map to decode[C++] break into nibbles, use std::map to decode
⚙️
ABCD Message
Week 21, 2026
#include "allheaders.hpp"
#include "main.hpp"
using namespace std;
//----------------------[GLOBALS]
vectorwholeStr;
vectorbcdStr;
string bcdString, binString;
fstream infile, wholefile, temp;
void init_BCD_map(unordered_map &BCDMap);
void bcdToText(string bcdCode);
void splitStr(const string& str);
// PROGRAM 52 - week 21 -------------------------------------[BEGIN LOGIC]------
int main()
{
try {
temp.open("tempfile", ios::in |ios::out | ios::trunc);//[split into nibbles]
wholefile.open("challenge21.bin", ios::in | ios::binary);//[challenge text]
while(getline(wholefile, binString))
{
wholeStr.push_back(binString);
}
int wholesize = wholeStr[0].length();
string getSplitStr = wholeStr[0];
splitStr(getSplitStr);
temp.close();
infile.open("tempfile", ios::in | ios::out);//[reopen nibbles file]
while(getline(infile, bcdString))
{
bcdStr.push_back(bcdString);
}
int size = bcdStr.size();
for(int i = 0; i < size; i++)
{
bcdToText(bcdStr[i]);
}
// PROGRAM 52 - week 21 ---------------------------------------[END LOGIC]------
}// end of try
catch (const runtime_error& exception)
{
cout << "Msg: " << exception.what() << "\n";
}
cout << "\n";
return 0;
}
//-------------------------------------------------------[FUNCTION DEFINITIONS]
void splitStr(const string& str)
{
for (size_t i = 0; i < str.length(); i += 4)
{
temp << str.substr(i, 4) << "\n";
}
}
//------------------------------------------------------------------------------
void bcdToText(string bcdCode)
{
map BCDMap
=
{
{"0000", "0"},
{"0001", "1"},
{"0010", "2"},
{"0011", "3"},
{"0100", "4"},
{"0101", "5"},
{"0110", "6"},
{"0111", "7"},
{"1000", "8"},
{"1001", "9"},
{"1010", "A"},
{"1011", "B"},
{"1100", "C"},
{"1101", "D"},
{"1110", "E"},
{"1111", "."}
};
size_t pos = 0;
while ((pos = bcdCode.find(' '))
!= string::npos)
{
string token = bcdCode.substr(0, pos);
if (BCDMap.find(token) != BCDMap.end())
{
cout << BCDMap[token];
}
else
{
cout << " ";
}
bcdCode.erase(0, pos + 1);
}
cout << BCDMap[bcdCode];
return;
}
