C++ 班级作业
我有点执着于完成这个项目 评估要求我们按照下面提供的信息,实施RockConcert和TicketHolder课程。课堂票证持有人代表为某场音乐会支付入场费的人。这个票务员课程应该记录它的费用和座位的位置 考虑到所提供的驱动程序,我已经构建了大部分代码,但如何编写RockConcert::sellTicket和RockConcert::getTicket的编码方法让我非常困惑 下面是代码 非常感谢 TicketHolder.hC++ 班级作业,c++,class,exception,throw,C++,Class,Exception,Throw,我有点执着于完成这个项目 评估要求我们按照下面提供的信息,实施RockConcert和TicketHolder课程。课堂票证持有人代表为某场音乐会支付入场费的人。这个票务员课程应该记录它的费用和座位的位置 考虑到所提供的驱动程序,我已经构建了大部分代码,但如何编写RockConcert::sellTicket和RockConcert::getTicket的编码方法让我非常困惑 下面是代码 非常感谢 TicketHolder.h #ifndef TicketHolder_h #define Tic
#ifndef TicketHolder_h
#define TicketHolder_h
#include <string>
#include <iostream>
using namespace std;
class TicketHolder {
public:
TicketHolder();
TicketHolder( std::string seat, double cost );
std::string getSeat() const;
double getCost() const;
friend std::ostream& operator<< (std::ostream& os, const TicketHolder & t);
private:
std::string my_Seat;
double my_Cost;
};
#endif
#ifndef RockConcert_h
#define RockConcert_h
#include <string>
#include <iostream>
#include <stdexcept>
#include "TicketHolder.h"
#include "SeatAlreadySold.h"
#include "SeatNotFound.h"
class RockConcert {
public:
public:
RockConcert( std::string date, std::string location );
void sellTicket( std::string seat, double cost ) throw (SeatAlreadySold);
TicketHolder getTicket( std::string seat ) throw (SeatNotFound);
double getProceeds( );
friend std::ostream& operator<< ( std::ostream& out, const RockConcert & r );
private:
TicketHolder myTickets[ 20 ];
int myNumberOfTicketsSeenSoFar;
std::string my_When;
std::string my_Where;
};
#endif
\ifndef TicketHolder\u h
#定义TicketHolder_h
#包括
#包括
使用名称空间std;
类票夹{
公众:
TicketHolder();
票夹(标准:弦座,双倍成本);
std::字符串getSeat()常量;
双getCost()常量;
friend std::ostream&operator我不确定这里到底是什么问题,但我倾向于创建一个std::map
映射票证ID(可以是一个类似“Row##Seat####Seat#的字符串,只要你是一致的)到TicketHolder
实例。你的TicketHolder
类(我认为最好只命名为Ticket
)应该包含一个布尔值“sell”属性
在您的getTicket()
方法中,在std::map
中进行一次简单的查找就可以了,而且速度非常快
您的sellTicket()
方法应首先调用getTicket()
,然后检查返回的票证的“已售出”属性(如果已售出,则引发异常)。如果未售出,则设置TicketHolder::sell=true
。您还应将票证成本添加到目前为止的总收益中
其他可能有用的一般规则:
- 尽可能在构造函数中使用初始化列表
- 避免C++中的异常说明符,它们可能不执行你认为的
- 除非您真的知道自己在做什么,否则始终按值抛出异常,并按常量引用捕获
- 避免复制函数参数中的
std::string
s和其他复杂对象
- 同样,仔细考虑方法返回类型何时应为副本、何时应为引用、何时应为常量引用以及何时应为(智能)指针
那么,问题是什么?@soon“我对如何编写RockConcert::sellTicket和,RockConcert::getTicket的编码方法感到非常困惑”@brorez这不是一个问题,这是一个声明。你尝试了什么,为什么没有成功?我们不是来为你做家庭作业的,更重要的是周日晚上的最后一件事。
#ifndef RockConcert_h
#define RockConcert_h
#include <string>
#include <iostream>
#include <stdexcept>
#include "TicketHolder.h"
#include "SeatAlreadySold.h"
#include "SeatNotFound.h"
class RockConcert {
public:
public:
RockConcert( std::string date, std::string location );
void sellTicket( std::string seat, double cost ) throw (SeatAlreadySold);
TicketHolder getTicket( std::string seat ) throw (SeatNotFound);
double getProceeds( );
friend std::ostream& operator<< ( std::ostream& out, const RockConcert & r );
private:
TicketHolder myTickets[ 20 ];
int myNumberOfTicketsSeenSoFar;
std::string my_When;
std::string my_Where;
};
#endif
#include "RockConcert.h"
#include "TicketHolder.h"
RockConcert::RockConcert( std::string date, std::string location ) {
my_When = date;
my_Where = location;
}
void RockConcert::sellTicket( std::string seat, double cost ) throw (SeatAlreadySold){
}
TicketHolder RockConcert::getTicket( std::string seat ) throw(SeatNotFound) {
}
double RockConcert::getProceeds( ){
return (myNumberOfTicketsSeenSoFar);
}
std::ostream& operator<< ( std::ostream& out, const RockConcert & r ){
return out;
}
// driver
// function main
#include "TicketHolder.h"
#include "RockConcert.h"
#include <iostream>
#include <stdexcept>
int main(int argc, const char * argv[])
{
RockConcert megaDeath( "Sept 1", "Staples Center" );
megaDeath.sellTicket( "Row Q Seat 20", 120.00 );
megaDeath.sellTicket( "Row Q Seat 21", 120.00 );
megaDeath.sellTicket( "Row SSS Seat 12", 50.00 );
TicketHolder ticket = megaDeath.getTicket( "Row Q Seat 21" );
// Print out the concert and its tickets
std::cout << megaDeath << std::endl;
try {
megaDeath.sellTicket( "Row T Seat 30", 65.00 );
} catch( SeatAlreadySold sas ) {
std::cout << "An error occurred here for the reason:";
std::cout << sas.what(std::endl:endl;
}
// Print out the library and its book - notice the difference
std::cout << megaDeath << std::endl;
// Let's try to throw some errors...
try {
// can't sell a ticket that has already been sold
megaDeath.sellTicket( "Row Q Seat 21", 120.00 );
std::cout << "An error occurred here..." ;
} catch( SeatAlreadySold sas ) {
sas.what();
}
try {
// can't get a ticket that has not been sold
megaDeath.getTicket( "Row A Seat 1" );
std::cout << "An error occurred here..." ;
} catch( SeatNotFound snf ) {
snf.what();
}
}