单选

●全加器是由两个加数X_i和Y_i以及低位来的进位C_i-1作为输入，产生本位和S_i以及向高位的进位C_i的逻辑电路。 (51) 和 (52) 分别是S_i和C_i的正确逻辑表达式。全加器亦可通过半加器来实现，此时S_i= (53) 。若某计算机采用8位带符号补码表示整数，则可由8个全加器(i=1，2，……8，i=8为最高位，即符号位)串接构成8位加法器，C₀=0。该加法器有一个状态寄存器，记录运算结果的状态。其中，N和V分别表示符号位与溢出标志位，则其逻辑表达式分别为 (54) 和 (55) 。

试题出自试卷《2011年程序员考试考前密卷（四）-上午试题》

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