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c++ - 这是有效的 C 代码吗?

转载 作者:太空狗 更新时间:2023-10-29 19:39:56 24 4
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Possible Duplicate:
What does the code do?

void duff(register char *to, register char *from, register int count)
{
register int n=(count+7)/8;
switch(count%8)
{
case 0: do{ *to++ = *from++;
case 7: *to++ = *from++;
case 6: *to++ = *from++;
case 5: *to++ = *from++;
case 4: *to++ = *from++;
case 3: *to++ = *from++;
case 2: *to++ = *from++;
case 1: *to++ = *from++;
}while( --n >0);
}
}

上面的 C 代码是有效的吗?如果是这样,它试图达到什么目的,为什么有人会做上面那样的事情?

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