#include <iostream>
#include<string>
using namespace std;
struct MM
{
	char name[20];
	int age;
};
int main()
{
	struct MM girl;
	MM mm;//C++中不需要struct關(guān)鍵字
	return 0;
}

#include <iostream>
#include<string>
using namespace std;
struct MM
{
	//屬性
	//數(shù)據(jù)成員
	char name[20];
	int age;
	//行為（方法）
	//成員函數(shù)
	void print()
	{
		cout << name << "\t" << age << endl;
	}
	void printData();//在結(jié)構(gòu)體中聲明，在外面實(shí)現(xiàn)
	int& getAge()
	{
		return age;
	}
};
//結(jié)構(gòu)體名限定，就是告訴別人這個(gè)函數(shù)來(lái)自哪里
void MM::printData()
{
	cout << name << "\t" << age << endl;
}
//結(jié)構(gòu)體中的變量必須要通過(guò)結(jié)構(gòu)體變量（結(jié)構(gòu)體指針）訪問(wèn)
//c++結(jié)構(gòu)體中的函數(shù)訪問(wèn)屬性，可以直接訪問(wèn)
int main()
{
	struct MM girl = {"小芳",28};
	MM mm = {"小麗",24};//C++中不需要struct關(guān)鍵字
	girl.print();
	(&mm)->printData();
	MM* p = &mm;
	p->printData();
	p->getAge() = 84;
	p->printData();
	p->age = 1991;
	p->printData();
	return 0;
}

#include<iostream>
#include<string>
using namespace std;
void testNoeMemory()
{
//申請(qǐng)不做初始化
	int* pInt = new int;
	*pInt = 123;
	cout << *pInt << endl;
	char* pChar = new char;
	*pChar = 'A';
	cout << *pChar << endl;
//申請(qǐng)內(nèi)存做初始化  ()給單個(gè)數(shù)據(jù)做初始化
	int* pNum = new int(134);
	cout << *pNum << endl;
	delete pInt;
	pInt = nullptr;
	delete pChar;
	pChar = nullptr;
	delete pNum;
	pNum = nullptr;
}
void testArrayMerrmory()
{
	//一維數(shù)組
	//1、不帶初始化
	//長(zhǎng)度可以是h變量，只要值就可以
	int* pInt = new int[3];//等效產(chǎn)生了 int pInt[3]的數(shù)組
	char* pstr = new char[15];
	strcpy_s(pstr, 15, "I love you");
	cout << pstr << endl;
	//帶初始化的 一堆數(shù)據(jù)用{}
	int* pNum = new int[3]{1, 2, 3};
	for (int i = 0; i < 3; i++)
	{
		cout << pNum[i] << " ";
	} 
	cout << endl;
	delete[] pNum;
	char* str = new char[20]{'A', 'B', '\0'};
	cout << str << endl;
	delete[] str;
	str = nullptr;
	str = new char[20]{"Ilove you"};
	cout << str << endl;
	delete[] str;
	str = nullptr;
	delete[] pInt;//數(shù)組的指針 不需要大小
	//釋放只有兩種形式 delete 指針 delete [] 指針
	//delete [][] p 沒(méi)有這種寫法
	pInt = nullptr;
}
int main()
{
	testNoeMemory();
	return 0;
}

#include<iostream>
#include<string>
using namespace std;
void testNoeMemory()
{
//申請(qǐng)不做初始化
	int* pInt = new int;
	*pInt = 123;
	cout << *pInt << endl;
	char* pChar = new char;
	*pChar = 'A';
	cout << *pChar << endl;
//申請(qǐng)內(nèi)存做初始化  ()給單個(gè)數(shù)據(jù)做初始化
	int* pNum = new int(134);
	cout << *pNum << endl;
	delete pInt;
	pInt = nullptr;
	delete pChar;
	pChar = nullptr;
	delete pNum;
	pNum = nullptr;
}
void testArrayMerrmory()
{
	//一維數(shù)組
	//1、不帶初始化
	//長(zhǎng)度可以是h變量，只要值就可以
	int* pInt = new int[3];//等效產(chǎn)生了 int pInt[3]的數(shù)組
	char* pstr = new char[15];
	strcpy_s(pstr, 15, "I love you");
	cout << pstr << endl;
	//帶初始化的 一堆數(shù)據(jù)用{}
	int* pNum = new int[3]{1, 2, 3};
	for (int i = 0; i < 3; i++)
	{
		cout << pNum[i] << " ";
	} 
	cout << endl;
	delete[] pNum;
	char* str = new char[20]{'A', 'B', '\0'};
	cout << str << endl;
	delete[] str;
	str = nullptr;
	str = new char[20];
	cout << str << endl;
	delete[] str;
	str = nullptr;
	delete[] pInt;//數(shù)組的指針 不需要大小
	//釋放只有兩種形式 delete 指針 delete [] 指針
	//delete [][] p 沒(méi)有這種寫法
	pInt = nullptr;
}
struct MM
{
	char* name;
	int age;
	void printMM()
	{
		cout << name << "\t" << age << endl;
	}
};
void testStructMerrory()
{
	//new一個(gè)對(duì)象
	int* p = new int(123);
	//結(jié)構(gòu)體只能用大括號(hào)
	MM* pMM = new MM;
	//結(jié)構(gòu)體中指針，要做二次申請(qǐng)，才能strcpy,或者賦值
	pMM->name = new char[20];
	strcpy_s(pMM->name, 20, "李四");
	pMM->age = 188;
	pMM->printMM();
	//申請(qǐng)的順序和釋放的順序是相反的
	delete[]pMM->name;
	delete pMM;
}
int main()
{
	//testNoeMemory();
	testStructMerrory();
	return 0;
}