Question

C++ 指出下面程序段中的错误并改正

#include<iostream.h>
class shape{
public:
int area () {return 0;}

};
class rectangle:public shape{
public:
int a, b;
void setlenth (int x,inty){a=x;b=y}

int area () {return a*b;}};
void main() {
rectangle r;
r.setlength (3,5);
shape *s=r;
cout<<r.area () <<endl;
cout <<s.area () <<endl:
}

Answer 1

又是考眼力的题，是有意考大家还是为啥呢？你在编译器里编译一下错误就都出来了啊，10来个错误吧，改完后是这样的

class shape{
public:
int area () {return 0;}

};
class rectangle:public shape{
public:
int a, b;
void setlength (int x,int y){a=x;b=y;}

int area () {return a*b;}};
void main() {
rectangle r;
r.setlength (3,5);
shape *s=&r;
cout<<r.area () <<endl;
cout <<s->area () <<endl;
}

Answer 2

程序 改完了，主要是 一些小错误，如：代码打错了等。

#include<iostream.h>

class shape
{
public:
int area ()
{return 0;}

};

class rectangle:public shape
{
public:
int a, b;

void setlength (int x,int y)
{a=x;b=y;}

int area ()
{return a*b;}
};

void main()
{
rectangle r;
r.setlength (3,5);
shape *s=&r;
cout<<r.area () <<endl;
cout <<s->area () <<endl;
}