定义一个圆类circle,该类有整型属性radius

classCircle{private:intm_nR;public:Circle(intnR){m_nR=nR;}floatOutputF(){return2*3.1415926*(float)m_

#include"stdio.h"constdoubleP=3.14;classCircle{public:virtualdoubleArea();voidR(doubles);doublegetr(

可以在父类中写虚函数的定义如果子类中重写了该虚函数,则根据指针可以调用到子类的虚函数；否则的话,调用的是父类的虚函数.极端情况下,纯虚函数也可以拥有定义,但由于不能生成父类的实例,定义出的函数不能直接

#include <iostream>using namespace std;class Box {\x09float leng

classcircle{intx;inty;floatradius;public:voidsetpoint(int&x,;int&y);voidsetradius(float&radius);floa

#include"stdio.h"#include"graphics.h"#definePI3.1415926;classcircle{public:voidset_x(){scanf("%d%d%d

namespaceEX1_4{publicclassshape{publicdoublePI=3.14;}publicclassRectangle:shape{publicintx,y,s,l;pub

classcircle{public:circle(doubleradius):_radius(radius){}~circle(void);private:double_radius;public:

#include#includeusingstd::cout;usingstd::cin;usingstd::endl;usingstd::string;classBook{public:Book(s

假设是控制台Dev#include <stdio.h>#include <stdlib.h>class Book{private: &n

classCircle{public:Circle(intnr){r=nr;}Circle(){}public:intr;intArea(){return3.14*r*r;}};classB{publ

以发送,楼主查收

publicabstractclassLocation{publicabstractdoublegetX();publicabstractdoublegetY();publicabstractvoid

把这三个类分别放到三个.java文件中,然后编译运行即可.publicclassCircle{privatedoubler;publicCircle(doubler){this.r=r;}public

2种差不多的方法,自己在VC6.0上面试试#include<iostream>usingnamespacestd;#definepi3.14classcircle{public:circl

#include"iostream"#include"cmath"usingnamespacestd;classCircle{public: Circle(doublex=0,doubley

publicclassCircle{privatedoubleradius;publicCircle(doubler){this.radius=r;}publicstaticvoidmain(Stri

classa{publcstatevoidb(){}}

publicclassZhengfangxing{privateintl;publicZhengfangxing(intl){//有参构造函数this.l=l;}publicintgetL

classCircle{privatedoubleradius;publicCircle(){this.radius=0;}publicCircle(doubler){this.radius=r;}p