Question

我在Visual Studio中获得了一个中止对话框。 this error message

这是代码：

#include <iostream>
#include <string>

class DateTime
{
public:
    DateTime(unsigned year, unsigned month, unsigned date, unsigned hour, unsigned minute, unsigned second);
    DateTime(unsigned year, unsigned month, unsigned date);
    ~DateTime();
    std::string get_string();
private:
    unsigned year;
    unsigned month;
    unsigned day;
    unsigned hour;
    unsigned minute;
    unsigned second;
};

std::string DateTime::get_string()
{
    // dd/MM/yyyy hh:mm:ss
    std::string day_s = (this->day < 10) ? "0" + this->day : std::to_string(this->day);
    std::string month_s = (this->month < 10) ? "0" + this->month : std::to_string(this->month);
    std::string year_s = std::to_string(this->year);
    std::string hour_s = (this->hour < 10) ? "0" + this->hour : std::to_string(this->hour);
    std::string minute_s = (this->minute < 10) ? "0" + this->minute : std::to_string(this->minute);
    std::string second_s = (this->second < 10) ? "0" + this->second : std::to_string(this->second);

    return day_s + "/" + month_s + "/" + year_s + " " + hour_s + ":" + minute_s + ":" + second_s;
}

DateTime::DateTime(unsigned year, unsigned month, unsigned date)
{
    if (month > 12 || day > 31)
            throw std::out_of_range("DateTime out of valid range");

    unsigned max_d = 31;

    if (month == 4 || month == 6 || month == 9 || month == 11)
        max_d = 30;
    else if (month == 2) {
        max_d = 28;
        if ((year % 400 == 0) || ((year % 4 == 0) && (year % 100 != 0)))
            max_d = 29;
    }

    if (day > max_d)
        throw std::out_of_range("DateTime out of valid range");

    this->year = year;
    this->month = month;
    this->day = day;

    this->hour = 0;
    this->minute = 0;
    this->second = 0;

}

DateTime::DateTime(unsigned year, unsigned month, unsigned date, unsigned hour, unsigned minute, unsigned second)
{
    if (month > 12 || day > 31 || hour > 24 || minute > 60 || second > 60)
            throw std::out_of_range("DateTime out of valid range");

    unsigned max_d = 31;

    if (month == 4 || month == 6 || month == 9 || month == 11)
        max_d = 30;
    else if (month == 2) {
        max_d = 28;
        if ((year % 400 == 0) || ((year % 4 == 0) && (year % 100 != 0)))
            max_d = 29;
    }

    if (day > max_d)
        throw std::out_of_range("DateTime out of valid range");

    this->year = year;
    this->month = month;
    this->day = day;
    this->hour = hour;
    this->minute = minute;
    this->second = second;

}

DateTime::~DateTime()
{
}


int main(int argc, char const *argv[])
{
    DateTime d1(2018, 5, 14);

    std::cout << d1.get_string();

    return 0;
}

请注意，我没有使用预编译的标头，因为我已在终端中编译它并尝试在Visual Studio中对其进行调试。在终端中我得到的错误是：

MYPROG.EXE
  未找到入口点
  程序入口点   _ZNKSt7__cxx1112basic_stringlcSt11char_traitsIcESalcEE7_M_dataEv可以   不能位于动态库链接C：...... \ myprog.exe

我很远不了解这意味着什么。有人能帮助我吗？

我认为这是运行时错误？我搜索过类似的错误，其中大部分与dll有关。是这种情况吗？

编辑：我用g++ myProg.cpp -o myprog

编译了源文件

Answer 1

string operator +没有任何接受unsigned右侧的重载。

替换

std::string day_s = (this->day < 10) ? "0" + this->day : std::to_string(this->day);

与

std::string day_s = (this->day < 10) ? "0" + std::to_string(this->day) : std::to_string(this->day);

等等。

C ++过程入口点错误

1 个答案: