在数值处理方面，类比数位转换器(ADC)之 无号数 ( unsigned number )被转换为有号数(signed number)，乘法运算以暂存器的移位来取代之，另建构一运算机制来防止溢位的产生。
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In most situations this does not pose a problem but for the translation of an IDL unsigned integer type whose value falls inside the number range of its highest order bit there will be a mismatch.
在多数情况下这不会发生问题，但是当一个IDL无符号整数取值正好落在最高位所限制的取值范围中时，类型转换就会发生不匹配的错误。
Unsigned short sem_num; (semaphore number).
unsigned short sem_num；(信号量个数)。
Given the same number of bits, unsigned integers usually represent twice the number of absolute values representable by signed integers.
给予相同的位元，无号整数通常能表示由有号整数所代表的值的绝对值的两倍数目。
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