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我不知道分段錯誤來自哪裏......任何想法？ 我與結構的工作分配結構中的分段錯誤錯誤
TestResult testResultFactory(std::string name, double mark)
{
//creating an object of TestResult
TestResult car;
car.name = name;
car.mark = mark;
return car;
}
Student studentFactrory(std::string name)
{
//Creating an object of student
Student house;
house.name = name;
house.testResults = 0;
house.numTestResults = 0;
return house;
}
void addTestResult(Student * student, std::string testName, double testMark)
{
//First we need to create a new array
(student->numTestResults)+=1;
TestResult *newTestArray = new TestResult[(student->numTestResults)];
//Now we loop through the old array and add it to the new one
int index = (student->numTestResults);
for (size_t i = 0; i < (index-1); i++)
{
newTestArray[i] = testResultFactory((student->testResults[i].name),(student->testResults[i].mark));
}
//Now we need to add the new student to the end of the array
newTestArray[index] = testResultFactory(testName, testMark);
(student->testResults) = newTestArray;
}
string studentBest(Student const * student)
{
//create variables as temps
string highestName;
double highestMark;
int index = (student->numTestResults);
//Setting the two variables to the first value
highestName = (student->testResults[0].name);
highestMark = (student->testResults[0].mark);
//Using a while loop to compare and get the best
for (size_t i = 0; i < index; i++)
{
if((student->testResults[i].mark)> highestMark)
{
highestMark = (student->testResults[i].mark);
highestName = (student->testResults[i].name);
}
}
//returning the string they want
string send = (highestName)+ " "+ doubleToString(highestMark)+ "%";
return send;
}
double studentAverage(Student const * student)
{
//Variables used as temps
double average = 0;
double counter = 0.0;
double running = 0;
int index = (student->numTestResults);
//Now we need to loop through each one and add to running and counter
for (size_t i = 0; i < index; i++)
{
counter++;
running += (student->testResults[i].mark);
}
//calculating the average;
average = (running)/counter;
return average;
}
void destroyStudent(Student * student)
{
delete [] (student->testResults);
(student->testResults)=0;
}
Subject subjectFactory(std::string name)
{
//Creating an object to use in subject factory
Subject lamp;
lamp.name = name;
lamp.numStudents = 0;
lamp.studentsAllocated = 0;
lamp.students = 0;
return lamp;
}
我的猜測是因爲出界陣列或不工作正常的指針發生了錯誤。
int getStudentIndex(Subject const * subject, std::string studentName)
{
int index;
int count = (subject->numStudents);
//loop to find the names and set index
for (size_t i = 0; i < count; i++)
{
if(studentName == ((subject->students[i].name)))
{
index = i;
}
else index = -1;
}
return index;
}
void addStudent(Subject * subject, std::string studentName)
{
//Variables as temps
Student *pointer =0;
int index = getStudentIndex(subject,studentName);
if(index != -1)
{
//Now we need to see if they are large enough
if((subject->studentsAllocated)==0)
{
//Set the allocated to 2
(subject->studentsAllocated) = 2;
pointer = new Student[2];
//Figure this out later
pointer[1] = studentFactrory(studentName);
(subject->students) = pointer;
}
else
{
//increase SA with 1.5
(subject->studentsAllocated) = (subject->studentsAllocated) * 1.5;
pointer = new Student[(subject->studentsAllocated)+1];
int count = (subject->studentsAllocated);
//Now we need to put all the other students in
for (size_t i = 0; i < count-1; i++)
{
pointer[i] = (subject->students[i]);
}
pointer[(subject->studentsAllocated)+1] = studentFactrory(studentName);
(subject->studentsAllocated) += 1 ;
}
//Once done just seet one equal to
(subject->students) = pointer;
}
else return;
}
void removeStudent(Subject * subject, std::string studentName)
{
//First get temps
int index = getStudentIndex(subject ,studentName);
int number = (subject->studentsAllocated);
int i = index;
//delete student
if(index == -1) return;
destroyStudent(&(subject->students)[index]);
//loop to shift the things
while (i<(number -1))
{
(subject->students)[i] = (subject-> students[i+1]);
}
//Removing the last one
(subject->numStudents) -= 1;
}
bool addTestResult(Subject * subject, std::string studentName, std::string testName, double testMark)
{
int index = getStudentIndex(subject ,studentName);
if(index != -1)
{
addTestResult(&(subject->students [index]),testName,testMark);
return true;
}
else
return false;
}
void printSubjectSummary(Subject const * subject)
{
cout<<(subject->name)<< ": with "<<(subject->numStudents)<<" students"<<endl;
//Variables to use in the loop
size_t indexLoop = subject->numStudents;
int i=0;
while (i< indexLoop)
{
cout<<(subject->students[i].name)<<" Average: "<<studentAverage(&(subject->students[i]))<<", Best: "<<studentBest(&(subject->students[i]))<<endl;
}
}
void destroySubject(Subject * subject)
{
//Variables
size_t indexLoop = subject->numStudents;
for (size_t i = 0; i < indexLoop; i++)
{
destroyStudent(&(subject->students[i]));
}
delete [] subject->students;
subject->students =0;
}
我似乎無法找到分割錯誤來自哪裏。即使從頭開始重新開始整個任務，似乎仍然會出錯。
有人可以幫助或指出故障可能來自何處。
在這裏，我們有有在有這麼多的邏輯錯誤的根本原因是包含在我上面的代碼
#ifndef STRUCTS_H
#define STRUCTS_H
struct TestResult{
double mark;//the test mark as a percentage
std::string name;//the test name
};
struct Student{
std::string name;
TestResult * testResults;//an arry of TestResults
size_t numTestResults;//the number of results for this student (also the size of the array)
};
struct Subject{
std::string name;
Student * students;//an array of Students
size_t numStudents;//the number of students added to the subject
size_t studentsAllocated;//the size of the Student arry(must never be smaller that numStudents)
};
#endif
請提供[mcve] –
https://stackoverflow.com/help/mcve –
實際崩潰說的是什麼？你可以發佈堆棧跟蹤嗎？ – Shark