Question

c++ 怎么把cpp文件拆分成.h文件及声明和实现文件。以下面程序为例。谢谢。

#include<iostream>
#include<string>
using namespace std;
class StudentID
{
int value;
public:
StudentID()
{
static int nextStudentID=0;
value=++nextStudentID;
cout<<"Assigning student id "<<value<<"\n";
}
};
class Student
{
string name ;
StudentID id;
public:
Student(string n="noName")
{
cout<<"Constructing student "+n+"\n";
name=n;
}
};
int main()
{
Student s("周立波");
return 0;
}

Answer 1

好惨烈的程序.
1.using namespace std;//看到这句,小程序
把.h文件和.cpp文件合起在一个cpp文件中写,反而显得雅致.

2.类student中的private变量 StudentID id, 构造函数或是公有函数至少提供一个去处理它.

3..h头文件是定义,.cpp文件是实现.你把class StudentID删了,编译器会告诉你怎么做的.
不是你不会分,而是c++基本用法你还不会.任一本入门书都有小例子.靠问是靠不出什么的.

Answer 2

//studentID.h
class StudentID{
int value;
public:
StudentID();
};
-------------------------------
//studentID.cpp
#include "studentID.h"
StudentID::Student(){
static int nextStudentID=0;
value=++nextStudentID;
cout<<"Assigning student id "<<value<<"\n";
}
------------------------------------------
//student.h
#include "studentID.h"
class Student{
string name ;
StudentID id;
public:
Student(string n);
};
---------------------------------
//student.cpp
#include "student.h"
Student::Student(string n="noName"){
cout<<"Constructing student "+n+"\n";
name=n;
}
=====================
//main.cpp
#include "student.h"
int main(void){
Student s("周立波");
return 0;
}

Answer 3

创建一个.h文件，把头文件和函数的声明全部写进去，然后在cpp文件里面把头文件的名字加.h写进去作为头文件，每一个类成员函数的实现写在里面，成员函数的名称前要加 类名：：

追问

我试了，不得行呀。你能抽空帮我分一下不？

Answer 4

// Student.h
#include <iostream>
#include <string>
using namespace std;

class StudentID
{
int value;
public:
StudentID();
};

class Student
{
string name ;
StudentID id;
public:
Student(string n="noName");
};

// Student.cpp
#include "Student.h"

StudentID::StudentID()
{
static int nextStudentID=0;
value=++nextStudentID;
cout<<"Assigning student id "<<value<<"\n";
}

Student::Student(string n)
{
cout<<"Constructing student "+n+"\n";
name=n;
}

// Main.cpp
#include "Student.h"

int main()
{
Student s("周立波");
return 0;
}

Answer 5

在(){}改成();
把{}，的内容写到.cpp中