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私はC++を信じられないほど新しいですし、例外処理のためのテストプログラムを作成するという課題があります。特定のクラスで定義されたものとmainで定義したものの両方を例外にするのに問題があります。誰かが私が持っているものを見渡して、どこが間違っているのかを指摘できますか？C++例外処理：例外をオブジェクトとして定義する
#ifndef STUDENT_H
#define STUDENT_H
#include <string>
using namespace std;
class Student
{
public:
Student();
Student(string thisStudentID);
void enroll(string thisSectionID);
private:
string studentID;
bool timeToThrow();
static int sneakyCount;
};
#endif
#include <string>
#include <iostream>
#include "Student.h"
#include "StudentException.h"
using namespace std;
// The constructor for this class accepts a Student ID
Student::Student(string thisStudentID)
{
// This first statement updates a variable used to help decide when to Throw an Exception
sneakyCount++;
// Any text will be accepted as the student ID in this implementation
if (!timeToThrow())
studentID = thisStudentID;
else
throw StudentException("Student " + thisStudentID + " has been expelled from this school");
}
// This default constructor shouldn't be used, so throwing an exception isn't so artificial, its
// the right thing to do. We will also find out if this constructor gets called at time that we don't expect.
Student::Student()
{
// This first statement updates a variable used to help decide when to Throw an Exception
sneakyCount++;
throw StudentException("Incorrect Call to Student Constructor - No Student ID Provided");
}
// This dummy function would enroll the student in a course
void Student::enroll(string thisSectionID)
{
// This first statement updates a variable used to help decide when to Throw an Exception
sneakyCount++;
if (!timeToThrow())
cout << endl << "Student: " << studentID << " is now enrolled in " << thisSectionID << endl;
else
throw StudentException("Section " + thisSectionID + " has been cancelled");
return;
}
// This is the code that helps decide when to throw an exception. You are welcome to look at it,
// but its only here to help generate unexpected exceptions. It will vary in different versions of Student
// as I play around with it.
int Student::sneakyCount = 0;
bool Student::timeToThrow()
{
if (sneakyCount == 4)
return true;
else
return false;
}
#ifndef STUDENTEXCEPTION_H
#define STUDENTEXCEPTION_H
#include <string>
using namespace std;
class StudentException
{
public:
StudentException(string thisErrorMessage);
string errorMessage();
private:
string message;
};
#endif
#include <string>
#include "StudentException.h"
using namespace std;
StudentException::StudentException(string whatWentWrong)
{
// Set the stored message within the object
// Any text will be accepted as the error message
message = whatWentWrong;
}
// Return the error message stored inside the object
string StudentException::errorMessage()
{
return message;
}
テストプログラムのための私のコード：教授から
#include <iostream>
#include <string>
#include "StudentException.h"
#include "Student.h"
using namespace std;
int main()
{
char again = 'n';
do
{
try
{
Student testStudent1("S0000001");
testStudent1.enroll("CSC-160-500");
}
catch(StudentException())
{
StudentException testException1("Pre-requisites required");
cout << testException1.errorMessage();
}
cout << "Again?\n";
cin >> again;
}
while(tolower(again) == 'y');
return 0;
}
私は唯一の例外投げとして簡単にテスト用のループはややランダムである必要があり。 catch（...）を使用すると例外が発生します。私が間違っていることのヒント？