在c++中对大小写混合的文本文件按字母顺序排序

#include <fstream>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

int main() {
    std::ifstream inputFile("input.txt");
    std::string line;
    std::vector<std::string> lines;

    if (inputFile.is_open()) {
        while (std::getline(inputFile, line)) {
            lines.push_back(line);
        }
        inputFile.close();
    } else {
        std::cout << "Failed to open the input file." << std::endl;
        return 1;
    }

    // 接下来的步骤将对读取的文本进行排序
    // ...
}

// 自定义比较函数，用于按字母顺序排序
bool caseInsensitiveCompare(const std::string& str1, const std::string& str2) {
    std::string str1Lower = str1;
    std::string str2Lower = str2;
    std::transform(str1Lower.begin(), str1Lower.end(), str1Lower.begin(), ::tolower);
    std::transform(str2Lower.begin(), str2Lower.end(), str2Lower.begin(), ::tolower);
    return str1Lower < str2Lower;
}

// 对读取的文本进行排序
std::sort(lines.begin(), lines.end(), caseInsensitiveCompare);

std::ofstream outputFile("output.txt");
if (outputFile.is_open()) {
    for (const std::string& sortedLine : lines) {
        outputFile << sortedLine << std::endl;
    }
    outputFile.close();
} else {
    std::cout << "Failed to open the output file." << std::endl;
    return 1;
}

#include <fstream>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

bool caseInsensitiveCompare(const std::string& str1, const std::string& str2) {
    std::string str1Lower = str1;
    std::string str2Lower = str2;
    std::transform(str1Lower.begin(), str1Lower.end(), str1Lower.begin(), ::tolower);
    std::transform(str2Lower.begin(), str2Lower.end(), str2Lower.begin(), ::tolower);
    return str1Lower < str2Lower;
}

int main() {
    std::ifstream inputFile("input.txt");
    std::string line;
    std::vector<std::string> lines;

    if (inputFile.is_open()) {
        while (std::getline(inputFile, line)) {
            lines.push_back(line);
        }
        inputFile.close();
    } else {
        std::cout << "Failed to open the input file." << std::endl;
        return 1;
    }

    std::sort(lines.begin(), lines.end(), caseInsensitiveCompare);

    std::ofstream outputFile("output.txt");
    if (outputFile.is_open()) {
        for (const std::string& sortedLine : lines) {
            outputFile << sortedLine << std::endl;
        }
        outputFile.close();
    } else {
        std::cout << "Failed to open the output file." << std::endl;
        return 1;
    }

    std::cout << "Sorting completed. Sorted content is written to output.txt." << std::endl;

    return 0;
}