c++ to c converter tool

Step 1: Include necessary headers

#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>
#include <regex>

Step 2: Define a function to read the input C++ file

std::string readInputFile(const std::string& filename) {
    std::ifstream inputFile(filename);
    if (!inputFile.is_open()) {
        std::cerr << "Error opening file: " << filename << std::endl;
        exit(EXIT_FAILURE);
    }

    std::ostringstream buffer;
    buffer << inputFile.rdbuf();
    return buffer.str();
}

Step 3: Define a function to convert C++ syntax to C syntax

std::string convertToC(const std::string& cppCode) {
    // Define regex patterns for C++ to C conversion
    std::regex cppToC[] = {
        std::regex("std::cout", std::regex_constants::icase),
        std::regex("<<", std::regex_constants::icase),
        // Add more conversion patterns as needed
    };

    // Define corresponding C replacements
    std::string cReplacements[] = {
        "printf",
        ",",
        // Add more replacements as needed
    };

    // Perform the actual conversion
    std::string cCode = cppCode;
    for (size_t i = 0; i < sizeof(cppToC) / sizeof(cppToC[0]); ++i) {
        cCode = std::regex_replace(cCode, cppToC[i], cReplacements[i]);
    }

    return cCode;
}

Step 4: Define a function to write the converted C code to a file

void writeOutputFile(const std::string& cCode, const std::string& filename) {
    std::ofstream outputFile(filename);
    if (!outputFile.is_open()) {
        std::cerr << "Error opening file for writing: " << filename << std::endl;
        exit(EXIT_FAILURE);
    }

    outputFile << cCode;
}

Step 5: Main function for program execution

int main(int argc, char argv) {
    if (argc != 3) {
        std::cerr << "Usage: " << argv[0] << " input.cpp output.c" << std::endl;
        return EXIT_FAILURE;
    }

    std::string inputFilename = argv[1];
    std::string outputFilename = argv[2];

    std::string cppCode = readInputFile(inputFilename);
    std::string cCode = convertToC(cppCode);
    writeOutputFile(cCode, outputFilename);

    return EXIT_SUCCESS;
}

Step 6: Compile and run the program with input and output file arguments

g++ cppToCConverter.cpp -o cppToCConverter
./cppToCConverter input.cpp output.c