c 宏 helloworld

a.h

#ifndef A_H_                                                                                                                                                                     
#define A_H_
typedef long int   int4;
#define MAX( x, y ) ( ((x) > (y)) ? (x) : (y) )
#define g_new(structs) malloc(sizeof(structs))
    

    int 
add_count (int a, int b);



#endif

　　

a.c

#include     "a.h"                                                                                                                                                               

    int 
add_count (int a, int b) 
{
    return a + b;
}               /* -----  end of function add_count  ----- */

　　

main.c

#include        <errno.h>
#include        <math.h>  
#include        <stdio.h> 
#include        <stdlib.h>
#include        <string.h>
#include        "a.h"    


typedef struct PageStr PageStrCPN;


struct PageStr
{
    char* p_ch_data;
    int a;
    int b;
};                                                                                                                                                                               

    int
main ( int argc, char *argv[] )
{
    int4 a = 10 , b = 100;    
    char *c = g_new(PageStrCPN);
    ((PageStrCPN*)c)->a = 10; 
    printf ("\nProgram %d\n\n", ((PageStrCPN*)c)->a  );
    printf ("\nProgram %d\n\n",(int)MAX(a, b) );
    free(c);
    return EXIT_SUCCESS;
}               /* ----------  end of function main  ---------- */

　　

编译：Makefile

all:main                                                                                                                                                                         
main:main.c a.c
        gcc -g -Wall -O0 main.c a.c -o main

　　

******output*******

Program 10


Program 100