[真2][9][单选]对于如下 C 语言程序
int main()
{
pid_t pid;
int a = 15;
pid = fork();
if (pid == 0)
printf("This is the son process, a = %d\n", ++a);
else
printf("This is the dad process, a = %d\n", --a;
}在 UNIX 操作系统中正确编译链接后运行，其运行结果为
This is the son process, a = 16 This is the dad process, a = 14
This is the son process, a = 16
This is the dad process, a = 14
This is the dad process, a = 16 This is the son process, a = 14
答案
This is the son process, a = 16 This is the dad process, a = 14
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 ID；否则，出错返回 1。a 初始值为 15，调用 fork(函数后，第一次返回子进程的值为 0，所以输出 This is the son process, a = 16，第二次返回父进程的值，所以输出 This is the dad process, a = 14。故选择 A 选项。
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