c++虚函数、子类中调用父类方法

全部 代码：

  1 #include<stdio.h>
  2 #include<string.h>
  3 #include<iostream>
  4 #include<algorithm>
  5 using namespace std;
  6 class point
  7 {
  8 private:
  9     int x,y,z;
 10 public:
 11     point(int xx,int yy,int zz)  //这个参数的名字尽量不要和类中变量名字重复
 12     {
 13         x=xx;
 14         y=yy;
 15         z=zz;
 16     }
 17     void Show()
 18     {
 19         printf("x:%d,y:%d,z:%d",x,y,z);
 20     }
 21
 22 };
 23 class color:public point
 24 {
 25 private:
 26     string s;
 27 public:
 28     color(int x,int y,int z,string fp):point(x,y,z)
 29     {
 30         s=fp;
 31     }
 32     void Show()
 33     {
 34         point::Show();   //要调用父类的函数就这样写
 35         //除此之外还可以子类和父类返回值参数相同，函数名相同，有virtual关键字，则由对象的类型决定调用哪个函数。
 36         cout<<" "<<s;
 37     }
 38 };
 39 int main()
 40 {
 41     point a(2,3,5);
 42     color b(10,20,50,"red");
 43     a.Show();
 44     printf("\n");
 45     b.Show();
 46     printf("\n");
 47     return 0;
 48 }
 49
 50 #include<stdio.h>
 51 #include<string.h>
 52 #include<iostream>
 53 #include<algorithm>
 54 using namespace std;
 55 class cellphone
 56 {
 57 private:
 58     string nature;
 59     int phone;
 60 public:
 61     void set_nature(string y)
 62     {
 63         nature=y;
 64     }
 65     void get_nature()
 66     {
 67         cout<<"品牌:"<<nature<<endl;
 68     }
 69     void set_phone(int y)
 70     {
 71         phone=y;
 72     }
 73     void get_phone()
 74     {
 75         cout<<"电话号码:"<<phone<<endl;
 76     }
 77     void pickup(int tel)
 78     {
 79         printf("接听来自%d的电话\n",tel);
 80     }
 81     void call(int tel)
 82     {
 83         printf("呼叫号码为%d的电话\n",tel);
 84     }
 85 };
 86 class smartphone:public cellphone
 87 {
 88 private:
 89     int full,sizes;
 90 public:
 91     void set_full(int y)
 92     {
 93         full=y;
 94     }
 95     void get_full()
 96     {
 97         cout<<"容量:"<<full<<endl;
 98     }
 99     void set_sizes(int y)
100     {
101         sizes=y;
102     }
103     void get_sizes()
104     {
105         cout<<"屏幕大小:"<<sizes<<endl;
106     }
107     void playmusic(char *mname)
108     {
109         printf("播放音乐:%s",mname);
110     }
111 };
112 int main()
113 {
114     cellphone x;
115     x.pickup(123);
116     x.call(123456);
117     smartphone y;
118     y.set_full(123);
119     y.get_full();
120     y.set_sizes(123);
121     y.get_sizes();
122     return 0;
123 }
124
125 #include<stdio.h>
126 #include<string.h>
127 #include<iostream>
128 #include<algorithm>
129 using namespace std;
130 class base
131 {
132 public:
133     int x,y;
134     base(int xx,int yy)
135     {
136         x=xx;
137         y=yy;
138     }
139     virtual void Show(){}  //定义纯虚函数要这样写，而不要像”virtual void Show()；“这样
140 };
141 class rectangular:public base
142 {
143 public:
144     rectangular(int x,int y):base(x,y)  //这就是调用子类构造函数并传参
145     {
146
147     }
148     void Show()
149     {
150         printf("周长为：%d\n",(x+y)*2);
151     }
152 };
153 int main()
154 {
155     rectangular  x(1,2);
156     x.Show();
157
158     return 0;
159 }
160
161 #include<stdio.h>
162 #include<string.h>
163 #include<iostream>
164 #include<algorithm>
165 using namespace std;
166 class geometry
167 {
168 public:
169     virtual void draw(){}
170 };
171 class rectangular:public geometry
172 {
173 public:
174     int x,y;
175     rectangular(int xx,int yy)
176     {
177         x=xx;  //高
178         y=yy;  //宽
179     }
180     void draw()
181     {
182         for(int i=0;i<y;++i)
183         {
184             printf("*");
185         }
186         printf("\n");
187         if(x<=1) return;
188         for(int i=0;i<x-2;++i)
189         {
190             printf("*");
191             for(int j=0;j<y-2;++j)
192                 printf(" ");
193             printf("*\n");
194         }
195         for(int i=0;i<y;++i)
196         {
197             printf("*");
198         }
199         printf("\n");
200     }
201 };
202 class triangle:public geometry
203 {
204 public:
205     int x;
206     triangle(int xx)
207     {
208         x=xx;
209     }
210     void draw()
211     {
212         for(int i=0;i<x-1;++i)
213         {
214             printf("*");
215             for(int j=0;j<i-1;++j)
216                 printf(" ");
217             if(i)
218                 printf("*");
219             printf("\n");
220         }
221         for(int i=0;i<x;++i)
222             printf("*");
223         printf("\n");
224     }
225 };
226 int main()
227 {
228     rectangular x(2,3);
229     x.draw();
230     printf("\n\n");
231     triangle y(5);
232     y.draw();
233     return 0;
234 }
235
236 #include<stdio.h>
237 #include<string.h>
238 #include<iostream>
239 #include<algorithm>
240 using namespace std;
241 class complexs
242 {
243 public:
244     int x,y,z;
245     complexs(int xx,int yy,int zz)
246     {
247         x=xx;
248         y=yy;
249         z=zz;
250     }
251     friend complexs operator+(complexs& a,complexs& b);
252
253     friend complexs operator-(complexs& a,complexs& b);
254
255 };
256 complexs operator+(complexs& a,complexs& b)
257 {
258     complexs temp(0,0,0); //之前没有给temp传参数，然后就一直报错 no matching function for call to 'complexs::complexs()'|
259     temp.x=a.x+b.x;
260     temp.y=a.y+b.y;
261     temp.z=a.z+b.z;
262     return temp;
263 }
264 complexs operator-(complexs& a,complexs& b)
265 {
266     complexs temp(0,0,0);
267     temp.x=a.x-b.x;
268     temp.y=a.y-b.y;
269     temp.z=a.z-b.z;
270     return temp;
271 }
272 int main()
273 {
274     complexs x(1,2,3);
275     complexs y(2,3,4);
276     complexs z=x+y;
277     printf("%d %d %d\n",z.x,z.y,z.z);
278     z=x-y;
279     printf("%d %d %d\n",z.x,z.y,z.z);
280     return 0;
281 }