Question

不久前，我被赋予了将Java程序转换为C ++的任务。

我已经这样做了，我开始遇到一些对我来说似乎没有任何意义的奇怪错误。

该程序包含三个文件。 main.ccp，date.ccp和date.h。

main.ccp

#include <cstdlib>
#include <iostream>

#include "Date.h"

using namespace ::std;

string weekday(Date date);

int main() {

    int day, month, year;

    cout << "What date (d m y)? ";

    cin >> day >> month >> year;

    Date event = Date(day, month, year);
    cout << ("That was a " + weekday(event));
    return 0;
}

string weekday(Date date) {
    const string days[] = {"Sunday", "Monday", "Tuesday", "Wednesday",
        "Thursday", "Friday", "Saturday"};

    Date trial = Date(1, 1, 1);
    int weekday = 6;

    if (Date::precedes(trial)) {
        return "Mysteryday";
    } else {
        while (trial.precedes(date)) {
            trial.advance();
            weekday = (weekday + 1) % 7;
        }
        return days[weekday];
    }
}

Date.ccp

#include "Date.h"

Date::Date(int day, int month, int year) {
        day_ = day;
        month_ = month;
        year_ = year;
    }

    int Date::getDay () {
        return day_;
    }

    void Date::setDay (int day) {
        day_ = day;
    }

    int Date::getMonth () {
        return month_;
    }

    void Date::setMonth (int month) {
        month_ = month;
    }

    int Date::getYear () {
        return year_;
    }

    void Date::setYear (int year) {
        year_ = year;
    }

    bool Date::isLeapYear () {

        bool lear = false;

        if (this->year_ <= 1752) {
            if (this->year_ % 4 == 0) {
                lear = true;
            }
        }
        else {
            lear = false;
        }
        if (this->year_ > 1752) {
            if (this->year_ % 4 == 0 && this->year_ % 100 != 0) {
                lear = true;
            }
            else if (this->year_ % 4 == 0 && this->year_ % 100 == 0 && this->year_ % 400 == 0) {
                lear = true;
            }
            else {
                lear = false;
            }
        }
        return lear;
    }

    int Date::daysInMonth () {
        // "30 days hath September ... "
        switch (this->month_) {
        case 9 :
        case 4 :
        case 6 :
        case 11 :
            return 30;
        default :
            return 31;
        case 2 :
            return this->isLeapYear() ? 29 : 28;
        }
    }

    void Date::advance () {
        this->day_;

        if (this->day_ == 3 && this->month_ == 9 && this->year_ == 1752) {
            day_ = 14;
            month_ = 9;
            year_ = 1752;
        }

        if (this->day_ > this->daysInMonth()) {
            this->day_ = 1;
            this->month_++;
        }
        if (this->month_ > 12) {
            this->month_ = 1;
            this->year_++;

        }
    }

   bool Date::precedes (Date date) {
        return this->year_ < date->year_
            || this->year_ == date->year_ && this->month_ < date->month_
            || this->year_ == date->year_ && this->month_ == date->month_ && this->day_ < date->day_;
    }

Date.h

#ifndef DATE_H
#define DATE_H

class Date {
public:
    Date (int day, int month, int year);
    int getDay();
    void setDay();
    int getMonth();
    void setMonth();
    int getYear();
    void setYear();
    bool isLeapYear();
    int daysInMonth();
    void advance();
    bool precedes(Date date);

private:
        int day_;
        int month_;
        int year_;
};

#endif  /* DATE_H */

我编译时似乎遇到了很多相同的错误。

Date.cpp：97：95：错误：' - ＆gt;'的基本操作数具有非指针类型'Date'

我不确定我是否做了正确的声明。

Answer 1

在课程结束}之后，您忘了加分号。

Answer 2

Date的类定义不以分号结尾。因为你在main.cpp中#include这个文件，所以标题之后的第一个语句是由于这个语法错误而不会解析的语句;因此你在错误的地方得到错误。

C ++函数问题

2 个答案: