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#include <sys/types.h>
#include <unistd.h>
pid_t fork(void);
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pid_t pid;
switch (pid = fork())
{
case -1:
/* ÕâÀïpidΪ-1£¬forkº¯Êýʧ°Ü */
/* һЩ¿ÉÄܵÄÔÒòÊÇ */
/* ½ø³ÌÊý»òÐéÄâÄÚ´æÓþ¡ */
perror("The fork failed!");
break;
case 0:
/* pidΪ0£¬×Ó½ø³Ì */
/* ÕâÀÎÒÃÇÊǺ¢×Ó£¬Òª×öʲô£¿ */
/* ... */
/* µ«ÊÇ×öÍêºó, ÎÒÃÇÐèÒª×öÀàËÆÏÂÃ棺 */
_exit(0);
default:
/* pid´óÓÚ0£¬Îª¸¸½ø³ÌµÃµ½µÄ×Ó½ø³ÌºÅ */
printf("Child's pid is %d\n",pid);
}
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ÓÃ ·¨: int abs(int i);
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#include <stdio.h>
#include <math.h>
int main(void)
{
int number = -1234;
printf("number: %d absolute value: %d\n", number, abs(number));
return 0;
}
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#pragma comment(lib, "ws2_32.lib")
#include <Winsock2.h>
#include <stdio.h>
void main()
{
//°æ±¾ÐÉÌ
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD(1,1); //0x0101
err = WSAStartup ......