Classes for C + +

The class that created C + + has two files: two files ending with. cpp and. h End with a header file, an externally exposed interface. C.PP is a concrete implementation. That is, declarations of variables and functions, or declarations of classes, are written in the. h header file.

? Defining classes with classmember defaults to privatethe scope of a member in a classPrivateprotected Public


The following is a simple creation of a simulated TimeTime Class
The header files are as follows:

  time.h//  classandobject////  Created by, on 15/1/19.//  Copyright (c) 2015 Huangyongrui. All rights reserved.//#ifndef __classandobject__time__#define __classandobject__time__#include <iostream> Using namespace std;//class Time {    //three Private member variable time division seconds    Int hour;    int min;    int sec;    Public:    //The declaration of the constructor method    //.h file can give the parameter default value, but be aware of the initialization list and implementation part in the CPP file time    (int h = 0,int m = 0,int s = 0);        Run    void Run ();    private://private    void Dida ();    void Show ();}; #endif/* Defined (__classandobject__time__) */

the. cpp files that are specifically implemented are as follows:

////time.cpp//classandobject////Created by 15/1/19.//Copyright (c) 2015 Huangyongrui. A ll rights reserved.//#include "Time.h"//note in the implementation of the function part of the parameter cannot appear by default//which class under which method//initialization list time::time (int h,int m,int s): Ho ur (h), Min (M), SEC (s) {cout << "" << Endl;} This is a global function that is not a method under the time class so you cannot get member variables/*void Show () {cout << hour << "when" << min << "minutes" << SEC << "SEC" << Endl;} *///which class is under which function void Time::show () {cout << hour << "when" << min << "Minute" << sec << "SEC" < ;< Endl;}    void Time::d Ida () {sec++;        if (= = sec) {sec = 0;    min++;        } if (= = min) {min = 0;    hour++;    } if (hour) {hour = 0;        }}//run void Time::run () {while (1) {Show ();        Dida ();        Represents a time time_t cur = time (0);//0 is the moment to get the current system//pay attention to understanding while (cur = = times (0)) {//Dead loop 1 seconds }    }}
 

The above is a simple class, and then you need to import the header file when other files are created to create the class object.

#include <iostream> #include "Time.h"  //double quotation marks are imported by their own class using namespace std;//main function int main () {    // You need to create a time object time    t (21,18,32);    T.show ();//private method access not to    //t.dida ();    T.run ();        return 0;}

The results of the operation are as follows:

21:18 32 sec 21:18 33 sec 21:18 34 sec. 21:18 35 sec. 21:18 36 sec program ended with exit Code:9

Classes for C + +