Welcome to Heaven's Endianness Number Analyzer!

heaven_endianness_checker.cpp

#include <iostream>
#include <bitset>
#include <stdexcept>
#include <iomanip>

// Function to check if the system is little endian
bool isSystemLittleEndian() {
    int testNumber = 1;
    return *(char*)&testNumber == 1;
}

// Function to print the byte at a specific index of a number in both decimal, binary and hexadecimal
void printByteAtIndex(int index, std::uint64_t number) {
    if (index < 0 || index >= sizeof(std::uint64_t)) {
        throw std::out_of_range("Index out of range");
    }

    // Get the byte at the specified index
    unsigned char byte = reinterpret_cast<unsigned char*>(&number)[index];

    // Convert the byte to a bitset to get its binary representation
    std::bitset<8> binaryRepresentation(byte);

    // Print the byte in decimal, binary and hexadecimal in a tabular format
    std::cout << std::setw(5) << index+1 
              << std::setw(10) << static_cast<unsigned>(byte) 
              << std::setw(15) << binaryRepresentation 
              << std::setw(15) << std::hex << std::uppercase << static_cast<unsigned>(byte) << std::dec 
              << std::endl;
}

int main() {
    try {
        std::uint64_t numberToAnalyze;

        std::cout << "Welcome to Heaven's Endianness Number Analyzer!" << std::endl;
        std::cout << "Number to analyze: ";
        std::cin >> numberToAnalyze;

        // Print the header of the table
        std::cout << std::setw(5) << "Byte" 
                  << std::setw(10) << "Decimal" 
                  << std::setw(15) << "Binary" 
                  << std::setw(15) << "Hexa" 
                  << std::endl;

        // Print the bytes of the number in the order determined by the system's endianness
        if (isSystemLittleEndian()) {
            for(int index = 0; index < sizeof(std::uint64_t); index++) {
                printByteAtIndex(index, numberToAnalyze);
            }
        } else {
            for(int index = sizeof(std::uint64_t) - 1; index >= 0; index--) {
                printByteAtIndex(index, numberToAnalyze);
            }
        }

        return EXIT_SUCCESS;
    } catch (const std::exception& exception) {
        std::cerr << "Error: " << exception.what() << std::endl;
        return EXIT_FAILURE;
    }
}

Welcome to Heaven's Endianness Number Analyzer!
Number to analyze: 655455

 Byte   Decimal         Binary           Hexa
    1        95       01011111             5F
    2         0       00000000              0
    3        10       00001010              A
    4         0       00000000              0
    5         0       00000000              0
    6         0       00000000              0
    7         0       00000000              0
    8         0       00000000              0