[英]C++ problem with virtual functions
I need to write something in C++. 我需要用C ++编写一些东西。 I have problem with virtual functions. 我对虚拟功能有疑问。
For example, in header file Human.h
I have this: 例如,在头文件Human.h
我具有以下内容:
class Human
{
public:
virtual int Age();
Human();
~Human();
}
In Human.cpp
file I have this: 在Human.cpp
文件中,我有:
#include<iostream>
#include "Human.h"
int Human::Age()
{
return 0;
}
I get these compile errors: 我得到这些编译错误:
Error 4 error C2371: 'Human::Age' : redefinition; different basic types c:\users\jan\desktop\testc\testc\human.cpp 5 1 TestC
Error 3 error C2556: 'Human Human::Age(void)' : overloaded function differs only by return type from 'int Human::Age(void)' c:\users\jan\desktop\testc\testc\human.cpp 5 1 TestC
Error 2 error C2628: 'Human' followed by 'int' is illegal (did you forget a ';'?) c:\users\jan\desktop\testc\testc\human.cpp 4 1 TestC
You have forgotten to end the class definition with a ;
您已经忘记了以“;”结尾的类定义;
It should read 它应该读
class Human
{
public:
virtual int Age();
Human();
~Human();
};
This will likely make the error go away. 这可能会使错误消失。 Also, always read the compiler's output: Error 2 error C2628: 'Human' followed by 'int' is illegal (did you forget a ';'?) c:\\users\\jan\\desktop\\testc\\testc\\human.cpp 4 1 TestC
另外,请始终阅读编译器的输出: Error 2 error C2628: 'Human' followed by 'int' is illegal (did you forget a ';'?) c:\\users\\jan\\desktop\\testc\\testc\\human.cpp 4 1 TestC
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