Explain Preprocessing
Hi,
I am confused about a c programming concept. It has to do with the #ifndef and the #define. I understand that #ifndef DEFINITION checks to see if there are any previous #define DEFINITIONs called. My question is, why is this useful? An example I have run across was written by a retired team member:
#ifndef __OPENCODE_H__
#define __OPENCODE_H__
the header file then proceeds to include a number of headers that make up opencode, and then ends the file with a #endif. Here is the whole header file:
#ifndef __OPENCODE_H__
#define __OPENCODE_H__
#ifndef __arm__
#include "../config/cbcconfig.h"
#endif
#include "opencode/common/depthlib.h"
#include "opencode/cbc/drive/drivelib.h"
#include "opencode/cbc/light/lightstart.h"
#include "opencode/cbc/sensor/sensorlib.h"
#include "opencode/cbc/sensor/link_depth.h"
#include "opencode/cbc/servo/servolib.h"
#include "opencode/create/create_accel.h"
#include "opencode/create/create_config.h"
#include "opencode/create/create_drive.h"
#include "opencode/create/create_music.h"
#include "opencode/create/create_script.h"
#include "opencode/create/create_sensor.h"
#include "opencode/create/create_align.h"
#include "opencode/create/create_depth.h"
#endif
From what I can tell it has to do with something called preprocessing? Can someone explain to me importance (or unimportance) of defining __OPENCODE_H__ at all. I'd like to be able to intelligently write my own libs in the future (and teach others how to), and this seems important. Thanks.
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Well in my knowledge i think C is the easiest language if compared to Java,PHP etc.
Yes even better ans easier than HTML too.simple coding and features make it popular.
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I think this is a relevant topic to get discussed and will be useful to students those who are studying programming. If you explain each program with a sample source code or its logic, then it will be more helpful to them to grasp the concept quickly.
I am really fed up with this topic as I had tried many times to learn the concept but I didn’t understand a little bit of it. I have gone through this blog and found that the author share the idea in very simple way. Thanks for the great effort.JoyJolt highball glass
I think this programming concept was most commonly used in viva and other exams. Preprocessing is a common topic and sometimes there should be a chance for deviating from your concept. I think students require a professional answer for this. Hope that you will definitely provide it here.private louvre museum tour
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