程序代码：

int main()
{
    __asm__("
    mov $1,%eax
    xor %ebx,%ebx
    int 0x80
    ")
}

这是一段很简单的代码，摘自网上很普遍的关于GCC内嵌汇编的资料。
编译报错：
asm.c:3:10: warning: missing terminating " character
asm.c: In function 'main':
asm.c:3: error: missing terminating " character
asm.c:4: error: expected string literal before 'xor'
asm.c:5:12: warning: missing terminating " character
asm.c:5: error: missing terminating " character


请教如何解决。

int main()
{
        __asm__("xor %ebx,%ebx\n\t"\
                 "mov $1,%eax\n\t"\
                 "int $0x80");
}
这种形式没有问题

程序代码：

naruto01@ubuntu:~$ gcc asm.c
asm.c:3:6: warning: missing terminating " character
asm.c: In function 'main':
asm.c:3: error: missing terminating " character
asm.c:4: error: expected string literal before 'xorl'
asm.c:5:13: warning: missing terminating " character
asm.c:5: error: missing terminating " character
naruto01@ubuntu:~$ cat asm.c
int main()
{
        asm("movl $1,%%eax;
             xorl %%ebx,%%ebx;
             int $0x80"
            );
}

代码引用http://www.第5小节代码，何解？