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#include<iostream>
class fushu
{
public:
explicit fushu(int num)//避免隐式转换，引发歧义
{
x = num;
y = num;
}
void print()
{
std::cout << x << "+" << y << "i" << std::endl;
}
operator int();
//不支持友元，仅仅支持成员函数
operator double()
{
return (double)(x + y);
}
protected:
private:
int x;
int y;
};
fushu::operator int()//类类之间的转换函数
{
return x *y;
}
//转换有赋值，（）构造
void main3()
{
int num(100.9);
fushu fushu1(num);//构造函数
fushu1.print();
int data = (int)fushu1 + 10;//类型转换可以把一个自定义类型当作基本数据类型来计算
std::cout << data << std::endl;
std::cin.get();
}
void main2()
{
int num ( 100.9);
fushu fushu1(num);//构造函数
fushu1.print();
//int data (fushu1);//转换
//int data = fushu1;
//int data = (int)fushu1;
//int data = int (fushu1);
//int data ( int(fushu1));
//std::cout << data << std::endl;
std::cin.get();
}
void main1()
{
int num (10.8);//基本数据类型
//隐式转换与显式转换，是否带有类型转换符
//fushu fushu1 = (fushu)10.8;
//fushu fushu1 = static_cast<fushu>(10.8);
fushu fushu1 =(fushu)10;//构造函数
//int numA = fushu1;
fushu1.print();
std::cin.get();
}
类与类之间的转换
#include <iostream>
class mianji
{
public:
friend class fushu;
mianji()
{
this->cx = 0;
this->cy = 0;
}
void setxy(int a,int b)
{
this->cx = a;
this->cy = b;
}
protected:
private:
int cx;
int cy;
};
class fushu
{
public:
friend class mianji;//友元可以访问私有变量
fushu(mianji mianji1)
{
this->x = mianji1.cx;
this->y = mianji1.cy;
}
void print()
{
std::cout << x << "+" << y << "i" << std::endl;
}
operator mianji()
{
mianji temp;
temp.cx = x;
temp.cy = y;
return temp;
}
protected:
private:
int x;
int y;
};
void main()
{
mianji mianji1;
//fushu fushu1 =(fushu) mianji1;
fushu fushu1(mianji1);//构造函数
//= static_cast<fushu>(mianji1);//构造函数进行转换
mianji mianji2;
mianji2.setxy(10, 20);
fushu1 = mianji2;
fushu1.print();
std::cin.get();
}类与类之间三种关系：包含，调用，继承。
#include "mainwindow.h"
#include <QApplication>
#include<stdlib.h>
//第一种关系，某一个类作为某一个类的部件
class mywindow
{
public:
MainWindow w;
};
class show
{
public:
void showwindow(MainWindow & w )//部分的使用一个类，调用一个类
{
w.show();
}
};
class newwindow:public MainWindow
{
public:
void run(char *str)
{
system(str);
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
newwindow new1;
new1.show();
new1.run("calc");
return a.exec();
}
int mainA(int argc, char *argv[])
{
QApplication a(argc, argv);
mywindow my1;
// my1.w.show();
show show1;
show1.showwindow(my1.w);
return a.exec();
}#pragma once
#include<iostream>
class coder
{
private:
char *str;
public:
coder();
~coder();
void girlfriend();
void coding();
protected://不允许外部访问，允许子类内部访问
int num;
};
#include "coder.h"
coder::coder()
{
std::cout << "coder create" << std::endl;
str = "锄禾日当午";
num = 100;
}
coder::~coder()
{
std::cout << "coder delete" << std::endl;
}
void coder::girlfriend()
{
std::cout << "一般都会写代码，可以创建一个对象，可是没有对象" << std::endl;
}
void coder::coding()
{
std::cout << "加班加点熬夜" << std::endl;
}
#pragma once
#include "coder.h"
//父类的私有成员，不行
//父类的保护成员，公有成员内部可以访问
//保护成员，公有成员都会变成保护成员
class ccoder:protected coder
{
public:
ccoder();
~ccoder();
};
#include "ccoder.h"
ccoder::ccoder()
{
}
ccoder::~ccoder()
{
}
#pragma once
#include "coder.h"
//父类的私有成员，不行
//父类的保护成员，公有成员都可以
//公有继承，不影响保护成员，公有成员属性变化
class cppcoder :
public coder
{
public:
cppcoder();
~cppcoder();
void coding();
void ui();
};
#include "cppcoder.h"
cppcoder::cppcoder()
{
std::cout << "cpp coder create" << std::endl;
}
cppcoder::~cppcoder()
{
std::cout << " cpp coder delete" << std::endl;
}
void cppcoder::ui()
{
std::cout << "QT真蛋疼" << std::endl;
//子类的内部可以访问
std::cout << (this->coder::num) << std::endl;
}
void cppcoder::coding()
{
std::cout << "CPP真蛋疼" << std::endl;
}
#pragma once
#include "coder.h"
//父类的私有成员，不行
//父类的保护成员，公有成员内部可以访问
//私有继承，公有成员，保护成员都变成私有成员
class javacoder :
private coder
{
public:
javacoder();
~javacoder();
};
#include "javacoder.h"
javacoder::javacoder()
{
this->num = 100;
}
javacoder::~javacoder()
{
}
//main.cpp
#include<iostream>
#include "coder.h"
#include "cppcoder.h"
#include "javacoder.h"
void main()
{
javacoder *pjava = new javacoder;
//pjava->num = 100;
}
void main3()
{
cppcoder *ptansheng = new cppcoder;
coder *pcode = new coder;
//protected不允许外部访问，允许子类内部访问
ptansheng->ui();
std::cin.get();
}
void main2()
{
coder *pcode = new cppcoder;//父类的指针，接受子类指针的地址
pcode->coding();
cppcoder *pcppcoder = reinterpret_cast<cppcoder *>(pcode);
pcppcoder->coding();
std::cout << typeid(pcode).name() << std::endl;
std::cout << typeid(pcppcoder).name() << std::endl;
std::cin.get();
}
void main1()
{
cppcoder *ptansheng = new cppcoder;
ptansheng->girlfriend();
ptansheng->ui();
//子类与父类重名，覆盖父类
ptansheng->coding();
//每一个子类都会生成一个默认的父类对象
//调用父类的同名方法
ptansheng->coder::coding();
//父类的私有无法使用
delete ptansheng;
std::cin.get();
}#include<iostream>
class father
{
public:
int num;
void print()
{
std::cout << num << std::endl;
}
father()
{
num = 99;
}
};
class son:public father
{
public:
int num;
void print()
{
std::cout << num << std::endl;
}
son() //子类覆盖父类
{
num = 89;
}
};
void main()
{
son *pson = new son;
pson->print();
pson->father::print();
father *p = reinterpret_cast<father *>( pson);
p->print();
std::cin.get();
}
#include<iostream>
class myclass
{
public:
int data;
static int num;//声明静态变量存在
myclass()
{
num++;//共享,统计对象的数目
}
static void print()
{
//this->data;//静态函数无法使用this指针
//data = 10;
std::cout << num << std::endl;
}
};
int myclass::num = 0;//静态变量初始化
//private私有继承，无法传承到下一代
class ziclass:protected myclass
{
void run()
{
this->print();
this->num;
}
};
class sunclass :protected ziclass
{
void goandrun()
{
this->ziclass::myclass::print();
}
};
void main()
{
ziclass *p = new ziclass;
ziclass z1;
sunclass *ps = new sunclass;
//int a;
//p->num;
//p->print();
p->myclass::num;
p->myclass::print();
//ps->print();
//ps->ziclass::myclass::print();
std::cin.get();
}基类的初始化
#include<iostream>
class myclass
{
public:
myclass() :x(0)
{
//x = 0;
std::cout << "myclass init without num" << std::endl;
}
myclass(int num) :x(num)
{
//x = num;
std::cout << "myclass init with num" << std::endl;
}
protected:
private:
int x;
};
class myziclass:public myclass
{
public:
myziclass()
{
std::cout << "myziclass init without num" << std::endl;
}
myziclass(int num) :myclass(num), x(num + 1), y(num+2)
{
std::cout << "myziclass init with num" << std::endl;
}
int x;
int y;
};
void main()
{
//指定构造函数
myziclass *p = new myziclass(10);
std::cin.get();
}立方体
#include <iostream>
#include<math.h>
class dian
{
public:
friend class xian;
dian(int a, int b, int c) :x(a), y(b), z(c)
{
}
void print()
{
std::cout << "x=" << x << ",y=" << y << ",z=" << z << std::endl;
}
private:
int x;
int y;
int z;
};
//继承没有意义,包含
class xian
{
public:
xian(dian dianx, dian diany) :dian1(dianx), dian2(diany)
{
}
double getlength()
{
double length = 0;
length = sqrt((dian1.x - dian2.x)*(dian1.x - dian2.x) + (dian1.y - dian2.y)*(dian1.y - dian2.y) + (dian1.z - dian2.z)*(dian1.z - dian2.z));
return length;
}
dian dian1;
dian dian2;
protected:
private:
};
class yuan :public xian
{
public:
yuan(dian dianx, dian diany) :xian(dianx,diany)
{
}
double getmianji()
{
return 3.1415926* (this->getlength())*(this->getlength());
}
double zhouchang()
{
return 3.1415926* 2*(this->getlength());
}
};
class qiu :public yuan
{
public:
qiu(dian dian1,dian dian2) :yuan(dian1,dian2)
{
}
double getmianji()
{
return 3.1415926* (this->getlength())*(this->getlength()) * 4;
}
double gettiji()
{
return 4 / 3.0*3.1415926* (this->getlength())* (this->getlength())* (this->getlength());
}
};
void main()
{
dian dian1(0, 0, 1);
dian dian2(0, 0, 6);
dian1.print();
dian2.print();
xian xian1(dian1, dian2);
std::cout << xian1.getlength() << std::endl;
yuan yuan1(dian1, dian2);
std::cout << yuan1.getmianji() << std::endl;
std::cout << yuan1.zhouchang() << std::endl;
qiu qiu1(dian1, dian2);
std::cout << qiu1.gettiji() << std::endl;
std::cout << qiu1.getmianji() << std::endl;
std::cin.get();
}
#include <QApplication>
#include<QLabel>
#include<stdlib.h>
class mylable:public QLabel
{
public:
mylable( char *str):QLabel(str)
{
}
void run (char *str)
{
system(str);
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
// QLabel *plabel =new QLabel("ABCDEF");
// plabel->show();
mylable my1("12345ABC");
my1.show();
my1.run("notepad");
return a.exec();
}#include "mainwindow.h"
#include <QApplication>
#include<QPushButton>
#include<QLabel>
class zajiao :public MainWindow,public QLabel,public QPushButton
{
public:
zajiao(char *str):QLabel(str),QPushButton(str)
{
this->MainWindow::setWindowTitle(str);
}
~zajiao()
{
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
zajiao zajiao1("ABCDEF12345");
zajiao1.QPushButton::show();
zajiao1.QPushButton::move(0,0);
zajiao1.QLabel::show();
zajiao1.MainWindow::show();
return a.exec();
}
int mainA(int argc, char *argv[])
{
QApplication a(argc, argv);
//MainWindow w;
//w.show();
// w.setWindowTitle("ABCD");
// QPushButton *p1=new QPushButton("ABC");
// p1->show();
return a.exec();
}#include<iostream>
#include<stdlib.h>
class A
{
};
class B
{
};
class myclass1
{
public:
void run(char *str)
{
system(str);
}
myclass1()
{
std::cout << "myclass1 is create" << std::endl;
}
~myclass1()
{
std::cout << "myclass1 is delete" << std::endl;
}
};
class myclass2
{
public:
int add(int a, int b)
{
return a + b;
}
myclass2()
{
std::cout << "myclass2 is create" << std::endl;
}
~myclass2()
{
std::cout << "myclass2 is delete" << std::endl;
}
};
class myclass:public myclass1,public myclass2,public A,public B
{
public:
void print(char *str)
{
std::cout << str << std::endl;
}
myclass()
{
std::cout << "myclass is create" << std::endl;
}
~myclass()
{
std::cout << "myclass is delete" << std::endl;
}
};
void main2()
{
myclass *pmy1 = new myclass;
delete pmy1;
std::cin.get();
}
void main1()
{
myclass my1;
my1.run("tasklist");
my1.myclass1::run("ipconfig");
std::cout << my1.add(10, 20) << std::endl;
std::cout << my1.myclass2::add(19,20) << std::endl;
my1.print("12345");
std::cin.get();
}虚基类
虚基类的作用
当一个基类被声明为虚基类后，即使它成为了多继承链路上的公共基类，最后的派生类中也只有它的一个备份。
#include <iostream>
class obj
{
public:
int num;
obj(int data) :num(data)
{
std::cout << "obj create\n";
}
obj()
{
num = 0;
std::cout << "obj create\n";
}
~obj()
{
std::cout << "obj delete\n";
}
};
class Aobj : virtual public obj
{
public:
Aobj(int data) :obj(data)
{
std::cout << "Aobj create\n";
}
~Aobj()
{
std::cout << "Aobj delete\n";
}
};
class Bobj : virtual public obj
{
public:
Bobj(int data) :obj(data)
{
std::cout << "Bobj create\n";
}
~Bobj()
{
std::cout << "Bobj delete\n";
}
};
class ABobj :public Aobj, public Bobj
{
public:
ABobj(int x, int y) :Aobj(x), Bobj(y)
{
std::cout << "ABobj create\n";
}
ABobj(int z) :Aobj(z), Bobj(z)
{
std::cout << "ABobj create\n";
}
~ABobj()
{
std::cout << "ABobj delete\n";
}
};
void main()
{
ABobj *p = new ABobj(10);
//std::cout << p->num;
std::cout << p->Aobj::obj::num << "\n";
std::cout << p->Bobj::obj::num << "\n";
delete p;
std::cin.get();
}#include <iostream>
#include <amp.h>
#include<thread>
#include<vector>
using namespace std;
using namespace std::this_thread;
using namespace concurrency;
void run()
{
int v[11] = { 'G', 'd', 'k', 'k', 'n', 31, 'v', 'n', 'q', 'k', 'c' };
array_view<int> av(11, v);
parallel_for_each(av.extent, [=](index<1> idx) restrict(amp)
{
av[idx] += 1;
});
for (unsigned int i = 0; i < 11; i++)
std::cout << static_cast<char>(av[i]);
std::cin.get();
}
int main1()
{
vector<thread*> threads;
for (unsigned int i = 0; i < 5; i++)
{
threads.push_back(new thread(run));
}
for (auto x : threads)
{
x->join();
}
std::cin.get();
return 0;
}#include <iostream>
#include <amp.h>
#include <WinBase.h>
#define COUNT 10000
float nickName_GPU[COUNT];
float nickName_CPU[COUNT];
double rungpu(int num)restrict(amp)
{
double temp = 0;
for (int i = 0; i < num; i++)
{
temp += i;
}
return temp;
}
double runcpu(int num)restrict(cpu)
{
double temp = 0;
for (int i = 0; i < num; i++)
{
temp += i;
}
return temp;
}
double runcpugpu(int num) restrict(amp, cpu)
{
double temp = 0;
for (int i = 0; i < num; i++)
{
temp += i;
}
return temp;
}
int main(void)
{
LARGE_INTEGER freq;
LARGE_INTEGER strt;
LARGE_INTEGER ed;
QueryPerformanceFrequency(&freq);
QueryPerformanceCounter(&strt);
concurrency::array_view<float> myView(COUNT, nickName_GPU); //将数据打入显存
concurrency::parallel_for_each(myView.extent, [=](concurrency::index<1> idx) restrict(amp)
{
for (int i = 0; i < 100000; i++)
{
myView[idx] = (myView[idx] + 0.1f) / 2.3f;
}
});
myView.synchronize();//显式等待GPU计算完成并将数据打回内存
QueryPerformanceCounter(&ed);
printf("GPU耗时: %d 毫秒\r\n", (ed.QuadPart - strt.QuadPart) * 1000 / freq.QuadPart);
QueryPerformanceCounter(&strt);
for (int idx = 0; idx < COUNT; idx++)
{
for (int i = 0; i < 100000; i++)
{
nickName_CPU[idx] = (nickName_CPU[idx] + 0.1f) / 2.3f;
}
}
QueryPerformanceCounter(&ed);
printf("CPU耗时: %d 毫秒\r\n", (ed.QuadPart - strt.QuadPart) * 1000 / freq.QuadPart);
for (int idx = 0; idx < COUNT; idx++)
{
if (nickName_CPU[idx] != nickName_GPU[idx])
{
puts("CPU和GPU的计算结果不相符！");
getchar();
return 0;
}
}
puts("测试结束");
getchar();
return 0;
}
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【C/C++学院】0822-类型转换函数与构造转换函数/类的继承/类的继承以及区别/继承静态成员与静态函数//继承实现代码重用/单继承QT案例/多继承简介以及实战/Gpu编程
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原文地址：http://blog.csdn.net/waldmer/article/details/49464329
