#include <iostream>
using namespace std;struct Teacher
{char name[64];int age;
};int getTeacher(Teacher **p) {Teacher *tmp = NULL;if (p == NULL) {return -1;}tmp = (Teacher *)malloc(sizeof(Teacher));if (tmp == NULL) {return -2;}tmp->age = 33;*p = tmp;
}int getTeacher2(Teacher* &myp) {myp = (Teacher *)malloc(sizeof(Teacher));if (myp == NULL) {return -1;}myp->age = 36;
}void FreeTeacher(Teacher *pT1) {if (pT1 == NULL) {return;}free(pT1);
}void main() {Teacher *pT1 = NULL;getTeacher(&pT1);cout << "age:" << pT1->age << endl;FreeTeacher(pT1);getTeacher2(pT1);cout << "age:" << pT1->age << endl;FreeTeacher(pT1);cout << "hello..." << endl;system("pause");
}

inline void printA() {int a = 10;cout << "a" << a << endl;
}

#include <iostream>
using namespace std;inline int myfunc(int a, int b) {return a < b ? a : b;
}#define MYFUNC(a,b)((a)<(b)?(a):(b))void main() {int a = 1;int b = 3;//int c = myfunc(++a, b); 输出结果：2；3；2int c = MYFUNC(++a, b); //宏替换并展开 ((++a) < (b) ? (++a) : (b))  输出结果：3；3；3cout << "a:" << a << ";b:" << b << ";c:" << c << endl;system("pause");
}

#include <iostream>
using namespace std;void myPrint(int x = 3) {cout << "x:" << x << endl;
}void myPrint2(int x = 3, int y = 4) {cout << "x:" << endl;
}void main() {//myPrint();//myPrint(4);myPrint2(4);system("pause");
}

#include <iostream>
using namespace std;void func(int a, int b, int) {cout << "a:" << a << "b:" << b << endl;
}void main() {//func(1, 2); 两个参数不适用func(1, 2, 3);

int func(int a, int b, int c = 0)
{return a * b * c;
}int func(int a, int b)
{return a + b;
}

//函数指针 基础的语法
//1声明一个函数类型
typedef void (myTypeFunc)(int a,int b) ;  //int
//myTypeFunc *myfuncp = NULL; //定义一个函数指针 这个指针指向函数的入口地址//声明一个函数指针类型
typedef void (*myPTypeFunc)(int a,int b) ;  //声明了一个指针的数据类型
//myPTypeFunc fp = NULL;  //通过  函数指针类型 定义了 一个函数指针 ,//定义一个函数指针 变量
void (*myVarPFunc)(int a, int b);
//

myPTypeFunc fp; //定义了一个 函数指针 变量

#include <iostream>
using namespace std;
class MyCircle {
public:double m_r;double m_s;
public:double getR() {return m_r;}void setR(double r) {m_r = r;}double getS() {m_s = 3.14*m_r*m_r;return m_s;}
};void printCircle01(MyCircle *pC) {cout << "r:" << pC->getR() << endl;cout << "s:" << pC->getS() << endl;
}void printCircle02(MyCircle &myc) {cout << myc.getS() << endl;
}void printCircle03(MyCircle myc) {}void main() {MyCircle c1, c2;c1.setR(10);cout << "c1 s:" << c1.getS() << endl;c1.setR(11);printCircle01(&c1);c2.setR(20);printCircle01(&c2);printCircle02(c2);system("pause");
}

#pragma once  //只包含一次相当于#ifndef __MYTEACHER_H_  //ctrl +shift + u 变大写
#define __MYTEACHER_H_
...
#endif

#pragma once
class Cube
{
public:void setA(int a);void setB(int b);void setC(int c);int getA();int getB();int getC();void setABC(int a, int b, int c);
private:int m_a;int m_b;int m_c;int m_s;int m_v;
public:int judgeCube(Cube &v2);
};

#include "Cube.h"void Cube::setA(int a) {m_a = a;
}void Cube::setB(int b) {m_b = b;
}
void Cube::setC(int c) {m_c = c;
}
int Cube::getA() {return m_a;
}
int Cube::getB() {return m_b;
}
int Cube::getC() {return m_c;
}void Cube::setABC(int a, int b, int c) {m_a = a; m_b = b; m_c = c;
}int Cube::judgeCube(Cube &v2) {if (m_a == v2.getA() && m_b == v2.getB() && m_c == v2.getC()) {return 1;}else {return 0;}
}

#include <iostream>
using namespace std;
#include "Cube.h"void main() {Cube v1, v2;v1.setABC(1, 2, 3);v2.setABC(2, 3, 4);cout << v1.judgeCube(v2)<< endl;system("pause");
}

#pragma once
class Point
{
public:int getX();int getY();void setPoint(int _x, int _y);
private:int x;int y;
};

#include "Point.h"void Point::setPoint( int _x, int _y) {x = _x; y = _y;
}
int Point::getX() {return x;
}
int Point::getY() {return y;
}

#pragma once
#include "Point.h"
class Circle
{
public:void setCircle(int _r, int _x, int _y);int judge(Point &p);
private:int r;int x;int y;
};

#include "Circle.h"
#include "Point.h"void Circle::setCircle(int _r, int _x, int _y) {r = _r; x = _x; y = _y;
}
int Circle::judge(Point &p) {int dd =(x - p.getX())*(x - p.getX()) + (y - p.getY())*(y - p.getY());if (dd <= r*r) {return 0;}else {return 1;}
}

#include <iostream>
using namespace std;
#include "Circle.h"
#include "Point.h"void main() {Circle c;Point p;c.setCircle(2, 3, 3);p.setPoint(4, 4);if (c.judge(p) == 0) {cout << "点在圆内" << endl;}else {cout << "点在圆外" << endl;}system("pause");
}