C±ê×¼¿âº¯Êý

º¯ÊýÃû: abort
¹¦  ÄÜ: Òì³£ÖÕÖ¹Ò»¸ö½ø³Ì
Óà ·¨: void abort(void);
³ÌÐòÀý:
#include <stdio.h>
#include <stdlib.h>
 
int main(void)
{
  printf("Calling abort()\n");
  abort();
  return 0; /* This is never reached */
}
 
 
 
º¯ÊýÃû: abs
¹¦  ÄÜ: ÇóÕûÊýµÄ¾ø¶ÔÖµ
Óà ·¨: int abs(int i);
³ÌÐòÀý:
#include <stdio.h>
#include <math.h>
 
int main(void)
{
  int number = -1234;
 
  printf("number: %d  absolute value: %d\n", number, abs(number));
  return 0;
}
 
 
 
º¯ÊýÃû: absread, abswirte
¹¦  ÄÜ: ¾ø¶Ô´ÅÅÌÉÈÇø¶Á¡¢Ð´Êý¾Ý
Óà ·¨: int absread(int drive, int nsects, int sectno, void *buffer);
 int abswrite(int drive, int nsects, in tsectno, void *buffer);
³ÌÐòÀý:
/* absread example */
 
#include <stdio.h>
#include <conio.h>
#include <process.h>
#include <dos.h>
 
int main(void)
{
  int i, strt, ch_out, sector;
  char buf[512];
 
  printf("Insert a diskette into drive A and press any key\n");
  getch();
  sector = 0;
  if (absread(0, 1, sector, &buf) != 0)
  {
     perror("Disk problem");
     exit(1);
  }
  printf("Read OK\n");
  strt = 3;
  for (i=0; i<80; i++)
  {
     ch_out = buf[strt+i];
     putchar(ch_out);
  }
  printf("\n");
  return(0);
}
 
 
 
 
º¯ÊýÃû: access
¹¦  ÄÜ: È·¶¨ÎļþµÄ·ÃÎÊȨÏÞ
Óà ·¨: int access(const char *filename, int amode);
³ÌÐòÀý:
#include <stdio.h>
#include <io.h>
 
int file_exists(char *filename);
 
int main(void)
{
  printf("Does NOTEXIST.FIL exist: %s\n",
  file_exists("NOTEXISTS.FIL") ? "YES" : "NO");