. H and. cpp files,

. H and. cpp files,

First, all the code can be placed in a cpp file. This is no different for computers,

However, for a project, bloated code is a disaster and is not suitable for reading and post-maintenance,

Therefore, the. h and. cpp files regulate programmer writing habits.

Usage

1. The. h file is directly # include to the required. cpp file, which is equivalent to copying the. h file code to the. cpp file.

2. The. cpp file must first generate the. o file and connect different. o files to generate executable files.

For example, there are three cpp files: a. cpp, B. cpp, and c. cpp. One of them contains the main () function, and the test program needs to be generated,

Steps:

1. generate three. o files: cc-c a. cpp

Cc-c B. cpp

Cc-c. cpp

In this way, three. o files are obtained: a. o, B. o, and c. o.

2. Generate the test program by link: cc-o test a. o B. o c. o

You can get the test executable program, and enter./test to execute the program.

Specifications

1. H files generally contain Class declarations;

2. the cpp file is generally a class function declared by the H file definition with the same name

Note: Generally, you can directly add main () to the cpp file to test the function of this module.

Example (g ++ ):

1 //point.h2 #include<stdio.h>3 typedef struct Point Point;4 struct Point{5     int x,y;6     Point(int _x,int _y);7     void ADD(Point _p);8     void Print();9 };

 1 //point.c 2 #include"point.h" 3 #define DEBUG 1 4 Point::Point(int _x,int _y){ 5     x=_x; 6     y=_y; 7 } 8 void Point::ADD(Point _p){ 9     x+=_p.x;10     y+=_p.y;11   12 ▽oid Point::Print(){13     printf("(%d,%d)\n",x,y);14 }15 16 #if DEBUG17 int main(){18     Point a(1,1);19     Point b(2,2);20     a.Print();21     a.ADD(b);22     a.Print();23     return 0;24 }25 #endif

Run:

G ++-c point. c
G ++-o test point. o

Obtain the executable program test

Run test to obtain the result:

[Zjp @ virtual-CentOS-for-test workstation] $./test
(1, 1)
(3, 3)