Decimal, hexadecimal and binary bidirectional convertors

README_msys2.txt

Compilation note: strip should be taken from /usr/bin
which strip
/usr/bin/strip
ls -ltr /c/msys64/usr/bin/strip /usr/bin/strip | sed "s/$USER/<username>/"
-rwxr-xr-x 2 <username> None 1257025 Oct 18 23:37 /usr/bin/strip
-rwxr-xr-x 2 <username> None 1257025 Oct 18 23:37 /c/msys64/usr/bin/strip
Installation instructions: https://packages.msys2.org/package/binutils?repo=msys&variant=x86_64

bin2dec.cpp

#include <iostream>
#include <string>
#include <cstdlib>
#include <cstring>

using namespace std;

int main(int argc, char**argv) {
    if(argc < 2) {
        auto s = string(*argv);
        auto exe_name = s.substr(s.find_last_of("/\\") + 1);
        cout << endl << "Usage: " << exe_name << " <n>" << endl << endl;
        return 1;
    }
    auto whitespace = string(" \t");
    if( 0 == strlen(argv[1]) ) {
        cout << endl << "ERROR: conversion failed - empty argument" << endl << endl;
        return 1;
    } else {
        auto arg=string(argv[1]);
        if( arg.find_first_not_of(whitespace) == string::npos ) {
            cout << endl << "ERROR: conversion failed - argument contains only whitespaces" << endl << endl;
            return 1;
        }
    }
    errno=0;
    char *pEnd;
    auto result = strtoull(argv[1],&pEnd,2);
    if( errno !=0 ) {
        cout << endl << "ERROR: conversion failed - " << strerror(errno) << endl << endl;
        return 1;
    }
    if( strlen(pEnd) > 0 ) {
        auto sEnd=string(pEnd);
        if( sEnd.find_first_not_of(whitespace) != string::npos ) {
            cout << endl << "ERROR: conversion failed - wrong input format" << endl << endl;
            return 1;
        }
    }
    cout << result << endl;
    return 0;
}

bin2hex.cpp

#include <iostream>
#include <string>
#include <cstdlib>
#include <cstring>

using namespace std;

int main(int argc, char**argv) {
    if(argc < 2) {
        auto s = string(*argv);
        auto exe_name = s.substr(s.find_last_of("/\\") + 1);
        cout << endl << "Usage: " << exe_name << " <n>" << endl << endl;
        return 1;
    }
    auto whitespace = string(" \t");
    if( 0 == strlen(argv[1]) ) {
        cout << endl << "ERROR: conversion failed - empty argument" << endl << endl;
        return 1;
    } else {
        auto arg=string(argv[1]);
        if( arg.find_first_not_of(whitespace) == string::npos ) {
            cout << endl << "ERROR: conversion failed - argument contains only whitespaces" << endl << endl;
            return 1;
        }
    }
    errno=0;
    char *pEnd;
    auto result = strtoull(argv[1],&pEnd,2);
    if( errno !=0 ) {
        cout << endl << "ERROR: conversion failed - " << strerror(errno) << endl << endl;
        return 1;
    }
    if( strlen(pEnd) > 0 ) {
        auto sEnd=string(pEnd);
        if( sEnd.find_first_not_of(whitespace) != string::npos ) {
            cout << endl << "ERROR: conversion failed - wrong input format" << endl << endl;
            return 1;
        }
    }
    cout << hex << result << endl;
    return 0;
}

dec2bin.cpp

#include <iostream>
#include <bitset>
#include <string>
#include <cstdlib>
#include <cstring>
#include <climits>

using namespace std;

int main(int argc, char**argv) {
    if(argc < 2) {
        auto s = string(*argv);
        auto exe_name = s.substr(s.find_last_of("/\\") + 1);
        cout << endl << "Usage: " << exe_name << " <n>" << endl << endl;
        return 1;
    }
    auto whitespace = string(" \t");
    if( 0 == strlen(argv[1]) ) {
        cout << endl << "ERROR: conversion failed - empty argument" << endl << endl;
        return 1;
    } else {
        auto arg=string(argv[1]);
        if( arg.find_first_not_of(whitespace) == string::npos ) {
            cout << endl << "ERROR: conversion failed - argument contains only whitespaces" << endl << endl;
            return 1;
        }
    }
    errno=0;
    char *pEnd;
    auto n = strtoull(argv[1],&pEnd,10);
    if( errno !=0 ) {
        cout << endl << "ERROR: conversion failed - " << strerror(errno) << endl << endl;
        return 1;
    }
    if( strlen(pEnd) > 0 ) {
        auto sEnd=string(pEnd);
        if( sEnd.find_first_not_of(whitespace) != string::npos ) {
            cout << endl << "ERROR: conversion failed - wrong input format" << endl << endl;
            return 1;
        }
    }
    if(0 == n) {
        cout << n << endl;
    } else {
        auto binary = bitset<sizeof(long long unsigned int)*CHAR_BIT>(n).to_string(); 
        cout<< binary.erase(0, binary.find_first_not_of('0')) << endl;
    }
    return 0;
}

dec2hex.cpp

#include <iostream>
#include <string>
#include <cstdlib>
#include <cstring>

using namespace std;

int main(int argc, char**argv) {
    if(argc < 2) {
        auto s = string(*argv);
        auto exe_name = s.substr(s.find_last_of("/\\") + 1);
        cout << endl << "Usage: " << exe_name << " <n>" << endl << endl;
        return 1;
    }
    auto whitespace = string(" \t");
    if( 0 == strlen(argv[1]) ) {
        cout << endl << "ERROR: conversion failed - empty argument" << endl << endl;
        return 1;
    } else {
        auto arg=string(argv[1]);
        if( arg.find_first_not_of(whitespace) == string::npos ) {
            cout << endl << "ERROR: conversion failed - argument contains only whitespaces" << endl << endl;
            return 1;
        }
    }
    errno=0;
    char *pEnd;
    auto result = strtoull(argv[1],&pEnd,10);
    if( errno !=0 ) {
        cout << endl << "ERROR: conversion failed - " << strerror(errno) << endl << endl;
        return 1;
    }
    if( strlen(pEnd) > 0 ) {
        auto sEnd=string(pEnd);
        if( sEnd.find_first_not_of(whitespace) != string::npos ) {
            cout << endl << "ERROR: conversion failed - wrong input format" << endl << endl;
            return 1;
        }
    }
    cout << hex << result << endl;
    return 0;
}

hex2bin.cpp

#include <iostream>
#include <bitset>
#include <string>
#include <cstdlib>
#include <cstring>
#include <climits>

using namespace std;

int main(int argc, char**argv) {
    if(argc < 2) {
        auto s = string(*argv);
        auto exe_name = s.substr(s.find_last_of("/\\") + 1);
        cout << endl << "Usage: " << exe_name << " <n>" << endl << endl;
        return 1;
    }
    auto whitespace = string(" \t");
    if( 0 == strlen(argv[1]) ) {
        cout << endl << "ERROR: conversion failed - empty argument" << endl << endl;
        return 1;
    } else {
        auto arg=string(argv[1]);
        if( arg.find_first_not_of(whitespace) == string::npos ) {
            cout << endl << "ERROR: conversion failed - argument contains only whitespaces" << endl << endl;
            return 1;
        }
    }
    errno=0;
    char *pEnd;
    auto n = strtoull(argv[1],&pEnd,16);
    if( errno !=0 ) {
        cout << endl << "ERROR: conversion failed - " << strerror(errno) << endl << endl;
        return 1;
    }
    if( strlen(pEnd) > 0 ) {
        auto sEnd=string(pEnd);
        if( sEnd.find_first_not_of(whitespace) != string::npos ) {
            cout << endl << "ERROR: conversion failed - wrong input format" << endl << endl;
            return 1;
        }
    }
    if(0 == n) {
        cout << n << endl;
    } else {
        auto binary = bitset<sizeof(long long unsigned int)*CHAR_BIT>(n).to_string(); 
        cout<< binary.erase(0, binary.find_first_not_of('0')) << endl;
    }
    return 0;
}

hex2dec.cpp

#include <iostream>
#include <string>
#include <cstdlib>
#include <cstring>

using namespace std;

int main(int argc, char**argv) {
    if(argc < 2) {
        auto s = string(*argv);
        auto exe_name = s.substr(s.find_last_of("/\\") + 1);
        cout << endl << "Usage: " << exe_name << " <n>" << endl << endl;
        return 1;
    }
    auto whitespace = string(" \t");
    if( 0 == strlen(argv[1]) ) {
        cout << endl << "ERROR: conversion failed - empty argument" << endl << endl;
        return 1;
    } else {
        auto arg=string(argv[1]);
        if( arg.find_first_not_of(whitespace) == string::npos ) {
            cout << endl << "ERROR: conversion failed - argument contains only whitespaces" << endl << endl;
            return 1;
        }
    }
    errno=0;
    char *pEnd;
    auto result = strtoull(argv[1],&pEnd,16);
    if( errno !=0 ) {
        cout << endl << "ERROR: conversion failed - " << strerror(errno) << endl << endl;
        return 1;
    }
    if( strlen(pEnd) > 0 ) {
        auto sEnd=string(pEnd);
        if( sEnd.find_first_not_of(whitespace) != string::npos ) {
            cout << endl << "ERROR: conversion failed - wrong input format" << endl << endl;
            return 1;
        }
    }
    cout << result << endl;
    return 0;
}

Makefile

MODULES=bin2dec dec2bin bin2hex hex2bin dec2hex hex2dec 
%: %.cpp
	g++ -O2 -o $@ $<
	strip $@
all: $(MODULES)
clean:
	-rm -rf $(MODULES)

Makefile.c++20

MODULES=bin2dec dec2bin bin2hex hex2bin dec2hex hex2dec 
%: %.cpp
	g++ -std=c++20 -O2 -o $@ $<
	strip $@
all: $(MODULES)
clean:
	-rm -rf $(MODULES)