编译出错：fatal error C1004: unexpected end of file found

[布丁果冻112233]

#include <iostream.h>

class A {
public:
A();
virtual void foo() {
cout << "This is A." << endl;
}
};

class B : public A {
public:
B();
void foo() {
cout << "This is B." << endl;
}
};
class A::A() {}
class B::B() {}

void main()
{
A *a = new B;
a->foo();
}

以上代码在VC6.0下编译出错：fatal error C1004: unexpected end of file found

如果把A();B();构造函数改为A(){}，B() {}这样的函数体，
再删除class A::A() {} class B::B() {}这两行。则编译通过。

请教各位这是什么原因？

[rollrock1987]

把A类的构造函数放到B定义前面

[闻缺陷则喜何志丹]

#include "iostream.h"

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

#include <iomanip>
#include <iostream.h>
#include <fstream>

#include <iostream.h>

class A {
public:
A();
virtual void foo() {
cout << "This is A." << endl;
}
};

class B : public A {
public:
B();
void foo() {
cout << "This is B." << endl;
}
};
//class A::A() {}
A::A() {}
//class B::B() {}
B::B() {}

void main()
{
A *a = new B;
a->foo();
}

[dukelee]

class A::A() {}  //成员函数前面加class，c++里有这种写法么？

[写不动代码的人]

写类时最好将声明和定义分开 ， 短小函数可用内联

[Lawrencewt]

#include <iostream.h>

class A {
public:
A();;
virtual void foo()
{
cout << "This is A." << endl; //"<<"之间不能有空格
}
};

class B : public A {
public:
B();
void foo() {
cout << "This is B." << endl;
}
};
A::A() {}
B::B() {}

void main()
{
A *a = new B;
a->foo();
}

[Lawrencewt]

#include <iostream.h>

class A {
public:
A();;
virtual void foo()
{
cout << "This is A." << endl; //"<<"之间不能有空格
}
};

class B : public A {
public:
B();
void foo() {
cout << "This is B." << endl;
}
};
A::A() {} //前面怎么能有class呢?
B::B() {}

void main()
{
A *a = new B;
a->foo();
}