fork的一个例子，好像人家是讲得很详细了，我还是不明白

jjl3

我做如下修改

#include <unistd.h>;
#include <sys/types.h>;

main ()
{
        pid_t pid;
        printf("fork!";    // printf("fork!\n";
        pid=fork();

        if (pid < 0)
                printf("error in fork!";
        else if (pid == 0)
                printf("i am the child process, my process id is %d\n",getpid());
        else
                printf("i am the parent process, my process id is %d\n",getpid());
}[/code]

结果是
[root@localhost c]# ./a.out
fork!i am the child process, my process id is 4286
fork!i am the parent process, my process id is 4285

但我改成printf("fork!\n";后，结果是
[root@localhost c]# ./a.out
fork!
i am the child process, my process id is 4286
i am the parent process, my process id is 4285

为什么只有一个fork!打印出来了？上一个为什么有2个？

jjl3