我有以下代码：
#include <iostream>
#include "Student.h" <-- fixed the problem
#include "SortedList.h" <-- fixed the problem
using namespace std;
int main() {
// points to the sorted list object
SortedList *list = new SortedList; //This is line 17
// array to hold 100 student objects
Student create[100];
int num = 100000; // holds different ID numbers
// fills an array with 100 students of various ID numbers
for (Student &x : create) {
x = new Student(num);
num += 100;
}
// insert all students into the sorted list
for (Student &x : create)
list->insert(&x);
delete list;
return 0;
}
我不断收到编译时错误：
main.cpp: In function ‘int main()’:
main.cpp:17: error: ‘SortedList’ was not declared in this scope
main.cpp:17: error: ‘list’ was not declared in this scope
main.cpp:17: error: expected type-specifier before ‘SortedList’
main.cpp:17: error: expected `;' before ‘SortedList’
main.cpp:20: error: ‘Student’ was not declared in this scope
main.cpp:20: error: expected primary-expression before ‘]’ token
main.cpp:20: error: expected `;' before ‘create’
main.cpp:25: error: expected `;' before ‘x’
main.cpp:31: error: expected primary-expression before ‘for’
main.cpp:31: error: expected `;' before ‘for’
main.cpp:31: error: expected primary-expression before ‘for’
main.cpp:31: error: expected `)' before ‘for’
main.cpp:31: error: expected `;' before ‘x’
main.cpp:34: error: type ‘<type error>’ argument given to ‘delete’, expected pointer
main.cpp:35: error: expected primary-expression before ‘return’
main.cpp:35: error: expected `)' before ‘return’
我的Student.cpp和SortedList.cpp文件编译得很好。它们都包含.h文件。我只是不明白为什么我在那条线上得到错误。这似乎是一个小问题。任何见解都将不胜感激。
UPDATE1：我原本包含了.h文件，但在尝试找出错误原因时我改变了它。但错误仍然存在于.h文件中。
UPDATE2：
SortedList.h
#ifndef SORTEDLIST_H
#define SORTEDLIST_H
#include "Student.h"
/*
* SortedList class
*
* A SortedList is an ordered collection of Students. The Students are ordered
* from lowest numbered student ID to highest numbered student ID.
*/
class SortedList {
public:
SortedList();
// Constructs an empty list.
SortedList(const SortedList & l);
// Constructs a copy of the given student object
~SortedList();
// Destructs the sorted list object
const SortedList & operator=(const SortedList & l);
// Defines the assignment operator between two sorted list objects
bool insert(Student *s);
// If a student with the same ID is not already in the list, inserts
// the given student into the list in the appropriate place and returns
// true. If there is already a student in the list with the same ID
// then the list is not changed and false is returned.
Student *find(int studentID);
// Searches the list for a student with the given student ID. If the
// student is found, it is returned; if it is not found, NULL is returned.
Student *remove(int studentID);
// Searches the list for a student with the given student ID. If the
// student is found, the student is removed from the list and returned;
// if no student is found with the given ID, NULL is returned.
// Note that the Student is NOT deleted - it is returned - however,
// the removed list node should be deleted.
void print() const;
// Prints out the list of students to standard output. The students are
// printed in order of student ID (from smallest to largest), one per line
private:
// Since Listnodes will only be used within the SortedList class,
// we make it private.
struct Listnode {
Student *student;
Listnode *next;
};
Listnode *head; // pointer to first node in the list
static void freeList(Listnode *L);
// Traverses throught the linked list and deallocates each node
static Listnode *copyList(Listnode *L);
// Returns a pointer to the first node within a particular list
};
#endif
Student.h
#ifndef STUDENT_H
#define STUDENT_H
/*
* Student class
*
* A Student object contains a student ID, the number of credits, and an
* overall GPA.
*/
class Student {
public:
Student();
// Constructs a default student with an ID of 0, 0 credits, and 0.0 GPA.
Student(int ID);
// Constructs a student with the given ID, 0 credits, and 0.0 GPA.
Student(int ID, int cr, double grPtAv);
// Constructs a student with the given ID, number of credits, and GPA.\
Student(const Student & s);
// Constructs a copy of another student object
~Student();
// Destructs a student object
const Student & operator=(const Student & rhs);
// Defines the assignment operator between two student objects
// Accessors
int getID() const; // returns the student ID
int getCredits() const; // returns the number of credits
double getGPA() const; // returns the GPA
// Other methods
void update(char grade, int cr);
// Updates the total credits and overall GPA to take into account the
// additions of the given letter grade in a course with the given number
// of credits. The update is done by first converting the letter grade
// into a numeric value (A = 4.0, B = 3.0, etc.). The new GPA is
// calculated using the formula:
//
// (oldGPA * old_total_credits) + (numeric_grade * cr)
// newGPA = ---------------------------------------------------
// old_total_credits + cr
//
// Finally, the total credits is updated (to old_total_credits + cr)
void print() const;
// Prints out the student to standard output in the format:
// ID,credits,GPA
// Note: the end-of-line is NOT printed after the student information
private:
int studentID;
int credits;
double GPA;
};
#endif
答案 0 :(得分：2)
您想要包含.h文件，而不是.cpp文件：
#include "Student.h"
#include "SortedList.h"
如果没有更多代码，很难推测问题可能是什么。
答案 1 :(得分：2)
您的主要功能似乎存在许多问题。这更正确：
int main() {
SortedList *list = new SortedList; //1
Student create[100]; //2
int num = 100000;
for (Student &x : create) { //3
x = Student(num); //4
num += 100;
}
for (Student &x : create) //5
list->insert(&x);
delete list;
return 0;
}
答案 2 :(得分：1)
您需要在cpp文件中包含定义类SortedList的标头
另外，我不知道您为什么在程序中包含cpp文件，请不要这样做。
编辑：更新您的问题
如果您已经在SortedList文件中包含了定义类cpp的geader文件，该文件会给出错误，可能您已将类包装在命名空间中。如果是这样，您应该使用完全限定名称对于类或在主cpp文件中使用类名的using声明。
答案 3 :(得分：1)
我怀疑SORTEDLIST_H是在处理SortedList.h之前定义的。
检查您是否在Student.h中定义了相同的SORTEDLIST_H ...
UPDATE1： 尝试将这些标志与g ++编译语句一起添加
g++ -USORTEDLIST_H -USTUDENT_H <fileNames>
答案 4 :(得分：0)
我怀疑SortedList已在名称空间中声明。
示例：
<强> SortedList.h
namespace MON {
class SortedList { ... };
} // << MON
<强>的main.cpp
int main() {
MON::SortedList *list = new MON::SortedList(); //This is line 17
....
}