[4][9][单选]请分析下列程序。
int main()
{
printf("This is in main program");
if(fork() == 0)
printf("I am in child process");
else
printf("I am in parent process");
}程序正确运行后结果是
This is in main program I am in child process I am in parent process
This is in main program I am in child process
This is in main program I am in parent process
This is in main program I am in child process This is in main program I am in parent process
答案
This is in main program I am in child process I am in parent process
解析
计算机程序设计中的 fork(函数的返回值：若成功调用一次则返回两个值，子进程返回 0，父进程返回子进程标识；否则，出错返回 -1。假设程序正确运行并分别产生子进程成功，那么，子进程为 0，父进程为进程号，故本题答案选择 This is in main program I am in child process I am in parent process 选项。涉及考点为第 3 章进程线程模型。
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