将C++字符串变量转换为long

#include<iostream>
#include<string>
#include <stdexcept>

int main() {
    std::string str = "12345";
    try {
        long num = std::stol(str);
        std::cout << "转换后的long值为："<< num<< std::endl;
    } catch (const std::invalid_argument& e) {
        std::cout << "无法转换为long类型：" << e.what()<< std::endl;
    } catch (const std::out_of_range& e) {
        std::cout << "转换范围超出long类型：" << e.what()<< std::endl;
    }
    return 0;
}