首頁猿問為什么p1，p2這兩個對象怎么識別不了？

為什么p1，p2這兩個對象怎么識別不了？

C++

寶慕林4294392 2022-12-17 17:13:02

#include<iostream>using namespace std;class point{private:int x;int y;public:point(){}point(int a,int b){x=a;y=b;}int getX(){return x;}int getY(){return y;}};class rect{private:point p1,p2;public:int length,width;void setvalue(){int a1,b1,a2,b2;cout<<"請輸入第一個點的數(shù)據(jù)：x,y:";cin>>a1>>b1;p1=point(a1,b1);cout<<"請輸入第二個點的數(shù)據(jù)：x,y:";cin>>a2>>b2;p2=point(a2,b2);}length=p1.getX()-p2.getX();width=p1.getY()-p2.getY();};int main(){rect rec1;rec1.setvalue();int area;area=length*width;cout<<area;return 0;}創(chuàng)建point類和rect類，rect類有兩個point類對象p1，p2私有成員，但是編譯時出現(xiàn)錯誤：'rect::p1' : member from enclosing class is not a type name, static, or enumeratorf:\c++6.0\microsoft visual studio\myprojects\test1\test1.cpp(40) : error C2065: 'p1' : undeclared identifierf:\c++6.0\microsoft visual studio\myprojects\test1\test1.cpp(40) : error C2228: left of '.getX' must have class/struct/union type

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2 回答

交互式愛情

TA貢獻(xiàn)1712條經(jīng)驗獲得超3個贊

class rect
{
private:
point p1,p2;
public:
int length,width;
void setvalue()
{
int a1,b1,a2,b2;
cout<<"請輸入第一個點的數(shù)據(jù)：x,y:";
cin>>a1>>b1;
p1=point(a1,b1);
cout<<"請輸入第二個點的數(shù)據(jù)：x,y:";
cin>>a2>>b2;
p2=point(a2,b2);
}
length=p1.getX()-p2.getX(); //這里錯了
width=p1.getY()-p2.getY(); //這里錯了
// C語言規(guī)定，所有代碼必須放在函數(shù)里面（除了全局變量的聲明和初始化）
};
---------------------------------------------
建議改為:
//前面的不變
class rect
{
private:
point p1,p2;
public:
int length,width;
void setvalue()
{
int a1,b1,a2,b2;
cout<<"請輸入第一個點的數(shù)據(jù)：x,y:";
cin>>a1>>b1;
p1=point(a1,b1);
cout<<"請輸入第二個點的數(shù)據(jù)：x,y:";
cin>>a2>>b2;
p2=point(a2,b2);
}
int GetLength()
{
length=p1.getX()-p2.getX();
return length;
}
int GetWidth()
{
width=p1.getY()-p2.getY();
return width;
}
};
int main()
{
rect rec1;
rec1.setvalue();
int area;
area=rec1.GetLength()*rec1.GetWidth();
cout<<area;
return 0;
}