作者hikaru06 (if(Ithink) exist; )
看板C_and_CPP
標題[問題] 請問語法哪裡有錯?
時間Mon Feb 2 19:22:27 2009
[error message]
main.cpp cannot call member function `Shape* Shape::Docreate()' without object
[main.h]
#include <iostream>
using namespace std;
class Shape
{
public: virtual void print() {
cout << "Shape." << endl;
}
Shape* Docreate();
};
class test : public Shape
{
public:
void print(){
cout << " test " << endl;
}
};
class Circle: public Shape
{
public: void print(){
cout << "Circle." << endl;
}
};
class Rect: public Circle
{
public: void print() {
cout << "Rect." << endl;
}
};
=============================================================================
[main.cpp]
#include <iostream>
#include "main.h"
using namespace std;
Shape* Shape::Docreate()
{
return new test;
}
int main()
{
Rect s2;
//Shape *s[2] = {new Circle(), new Rect()};
Shape *s3 = Shape::Docreate(); // error ! 不太知道小弟觀念哪裡有錯，請指教!
Shape *s1 = new Circle;
s1 = &s2;
s3->print();
s1->print();
//s2->print();
system("pause");
return 0;
}
--
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◆ From: 125.225.16.127
1F：推 chrisdar:static Shape* Docreate() {...} 02/02 19:32
2F：→ hikaru06:謝謝樓上，可以請問為何要加上static? 02/02 19:56
3F：推 chrisdar:是從這裡看的 Shape::Docreate() 02/02 19:58
4F：推 Dreamer77:這樣不用宣告object 即可使用member variable/function 02/03 22:23
5F：→ hikaru06:樓上 我搞懂了 謝謝您~~ 02/04 22:33