C++枚举类型用法总结(枚举字符常量代替常量)

#pragma once
typedef unsigned long Item;
 
class CEnumTest
{
public:
	CEnumTest();
	~CEnumTest();
 
	const void show() const;		//后面的const表示该函数不可更改类对象，也即是不能更改类对象的成员变量
private:
	enum {One=1,Two=2,Three=3};
 
	Item item[Three];
};

#include "EnumTest.h"
#include <iostream>
 
CEnumTest::CEnumTest()
{
}
 
const void CEnumTest::show() const
{
	std::cout <<"this->Three=="<<this->Three<<std::endl;
}
 
CEnumTest::~CEnumTest()
{
}

#include <iostream>
#include "EnumTest.h"	
 
int main()
{
	CEnumTest *enumTest = new CEnumTest();
	enumTest->show();
 
	system("pause");
	return true;
}

enum class Data1{ First = 1, Second = 2, Third = 3 };
enum class Data2{ First = 7, Second = 8, Fourth = 9 };

#include <iostream>
#include "EnumTest.h"	
 
enum class Data1{ First = 1, Second = 2, Third = 3 };
enum class Data2{ First = 7, Second = 8, Fourth = 9 };
 
int main()
{
	CEnumTest *enumTest = new CEnumTest();
	enumTest->show();
 
	/*枚举类*/
	std::cout << "(int)Data1::First==" << (int)Data1::First << std::endl;	//枚举类Data1可以直接用作用域解析运算符::调用对应枚举成员常量Data1::First
	std::cout << "(int)Data2::First==" << (int)Data2::First << std::endl;	//枚举类Data2可以直接用作用域解析运算符::调用对应枚举成员常量Data2::First
 
	system("pause");
	return true;
}

enum Data1{ First = 1, Second = 2, Third = 3 };