string 截取 c++

以下是两种C++中字符串截取的方法：
1. 使用C语言的strtok方法[^1]

#include <iostream>
#include <vector>
#include <cstring>

std::vector<std::string> stringSplit(const std::string& strIn, char delim) {
    char* str = const_cast<char*>(strIn.c_str());
    std::string s;
    s.append(1, delim);
    std::vector<std::string> elems;
    char* splitted = strtok(str, s.c_str());
    while (splitted != NULL) {
        elems.push_back(std::string(splitted));
        splitted = strtok(NULL, s.c_str());
    }
    return elems;
}

int main() {
    std::string str = "Hello,World,How,Are,You";
    std::vector<std::string> result = stringSplit(str, ',');
    for (const auto& s : result) {
        std::cout << s << std::endl;
    }
    return 0;
}

输出：

Hello
World
How
Are
You

2. 使用stringstream和getline配合使用

#include <iostream>
#include <vector>
#include <sstream>

std::vector<std::string> stringSplit(const std::string& str, char delim) {
    std::stringstream ss(str);
    std::string item;
    std::vector<std::string> elems;
    while (std::getline(ss, item, delim)) {
        if (!item.empty()) {
            elems.push_back(item);
        }
    }
    return elems;
}

int main() {
    std::string str = "Hello,World,How,Are,You";
    std::vector<std::string> result = stringSplit(str, ',');
    for (const auto& s : result) {
        std::cout << s << std::endl;
    }
    return 0;
}

输出：

Hello
World
How
Are
You