C language program routine file structure

In the past, writing C language programs are written in a file, hundreds of lines, can you have time to practice the algorithm, now engage in modular programming, so-called modular programming, means a program contains multiple source files ( .c files and .h files), each .c file can be referred to as a module. 1, the file structure of routines 2, each file code main.c source code: #include #include "incrude / func.h" INTMAIN () { INTN1 = 1, N2 = 10; Printf ("from% D to% D and% LD \ N", N1, N2, SUM (N1, N2)); Printf ("From% D by% D% LD \ N", N1, N2, MULT (N1, N2)); Printf ("OS:% S \ N", OS); Printf ("Power By% S (% s)", getWebName (), getWeburl ()); Return0; } Math.c source code: / / No function declaration or macro in func.h, or it is not included. #include "../include/func.h" / / Add to EndNumlongsum from fromnum (intFromnum, intendnum) { Inti; LongResult = 0; // Parameter does not meet the rules, return -1 IF (fromnum<0 || Endnum<0 || Endnum { Return-1; } For (i = fromnum; i< = endnum; i ++) { Result + = i; } // Return to equal to 0 value ReturnResult; } / / Take the endnumlongmult (intfromnum, intendnum) from fromnum { Inti; LongResult = 1; // Parameter does not meet the rules, return -1 IF (fromnum<0 || Endnum<0 || Endnum { Return-1; } For (i = fromnum; i< = endnum; i ++) { Result * = i; } // Return to equal to 0 value ReturnResult; } Web.c source code: // Use the macro definition in func.h, must contain it, otherwise compile errors #include "../include/func.h"char* getWebName () { ReturnWeb_name; } char * getWeburl () { ReturnWeb_url; } Func.h source code: #ifndef _func_h #define _func_h // use macro definition instead of global variables #define os "linux" #define web_url "http://www.baidu.com" #define web_name "Baidu" // can also omit extern, but for program readability, it is recommended to write EXTERNLONGSUM (INT, INT); Externlongmult (int, int); EXTERNCHAR * GETWEBNAME (); EXTERNCHAR * GETWEBURL (); #ENDIF operation result: From 1 to 10 and 55 from 1 to 10 to 10 in 3628800os: Linux, read full text, original title: Pulk easy to understand! Linux C modular programming instance explanation Article Source: [Micro Signal: GH_C472C2199C88, WeChat public number: embedded ARM] Welcome to add attention! Please indicate the source of the article.

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