如何从C++中的格式化字符串派生in？

#include <iostream>
#include <sstream>

int main() {
    std::string formatString = "123 4.56";
    int intValue;
    float floatValue;

    std::stringstream ss(formatString);
    ss >> intValue >> floatValue;

    std::cout << "Int value: " << intValue << std::endl;
    std::cout << "Float value: " << floatValue << std::endl;

    return 0;
}

Int value: 123
Float value: 4.56

#include <cstdio>

int main() {
    const char* formatString = "123 4.56";
    int intValue;
    float floatValue;

    sscanf(formatString, "%d %f", &intValue, &floatValue);

    printf("Int value: %d\n", intValue);
    printf("Float value: %f\n", floatValue);

    return 0;
}

Int value: 123
Float value: 4.560000

#include <iostream>
#include <regex>

int main() {
    std::string formatString = "123 4.56";
    int intValue;
    float floatValue;

    std::regex pattern("(\\d+) (\\d+\\.\\d+)");
    std::smatch matches;

    if (std::regex_search(formatString, matches, pattern)) {
        intValue = std::stoi(matches[1]);
        floatValue = std::stof(matches[2]);

        std::cout << "Int value: " << intValue << std::endl;
        std::cout << "Float value: " << floatValue << std::endl;
    }

    return 0;
}

Int value: 123
Float value: 4.56