c misc test

/*

  *Filename: hl.c

  *Author: hemmingway <[e-mail]>

  *Description: this a misc practice program

  *Compile with: gcc -g -Wall -o hl.debug  hl.c

  */



 #include <stdio.h>

 #include <time.h>

 #include <stdlib.h>

 #include <string.h>



 #define ENABLE_DEBUG 1   //else, comment this line

 #ifdef ENABLE_DEBUG

 #define DEBUG_LOG(fmt,...) fprintf(stderr, "%s:%d: " fmt "\n",   \

__func__, __LINE__, ## __VA_ARGS__)

 #else

 #define DEBUG_LOG(fmt, ...) do {} while (0)

 #endif



 /*question: does this line can be works??*/

 // #define DEBUG_LOG(fmt,...) fprintf(stderr, "%s:%d: " (fmt) "\n",__func__, __LINE__, ## __VA_ARGS__)





 int max(int i, int j)

 {

if(i>i)

return (i);

else

return (j);

 }



 int main()

 {

int i, j, k;

i = 3;

j = 5;



time_t timep;

struct tm *tim;

char *p;

timep = time((time_t *)NULL);

tim = gmtime(&timep);

p = malloc(30*sizeof(char));

strncpy(p, ctime(&timep), 30);
 

printf("hello, world..now time is:%d-%d-%d %d:%d:%d\n", 1900 + tim->tm_year,1+ tim->tm_mon, 

tim->tm_mday,8 + tim->tm_hour, tim->tm_min, tim->tm_sec);

k = max(i,j);

printf("ctime: %s, max: %d\n",p, k);



//test c99 comment



//c89

printf( "The file is %s. \n", __FILE__ );

     printf( "The date is %s. \n", __DATE__ );

     printf( "The time is %s. \n", __TIME__ );

     printf( "This is line %d. \n", __LINE__ );

     printf( "__STDC__ is: %d \n", __STDC__ );





//c99

     printf( "This function is %s. \n", __func__ );  //__func__ c99的当前调用的函数名



//test debug_log



printf("\n\ntest debug log macro.\n\n");

     

DEBUG_LOG("Registering domain event cbs");

DEBUG_LOG("debug time, ctime: %s", p);





free(p);


return 0;

 }