计算机在进行浮点数的相加（减）运算前需先进行对阶操作，若x的阶码大于y的阶码，则应将（ ）。
- A.x的阶码缩小至与y的阶码相同，并对x的尾数进行算术左移
- B.x的阶码缩小至与y的阶码相同，并对x的尾数进行算术右移
- C.y的阶码扩大至与x的阶码相同，并对y的尾数进行算术左移
- D.y的阶码扩大至与x的阶码相同，并对y的尾数进行算术右移
正确答案及解析
正确答案
解析
在浮点数加减运算时，首先要进行对阶，根据对阶的规则，阶码和尾数将进行相应的操作。对阶，首先应求出两数阶码Ex和Ey之差，即△E=Ex-Ey若△E=0，表示两数阶码相等，即Ex=Ey；若△E>0，表示Ex>Ey；若△E＜0，表示Ex＜Ey。当Ex≠Ey时，要通过尾数的移位来改变Ex或Ey，使Ex=Ey相等。对阶的规则是：小阶向大阶看齐。即阶码小的数的尾数右移，每右移一位，阶码加1，直到两数的阶码相等为止。如：Ex=Ey，无需对阶。Ex>Ey，则My右移。每右移一位．Ey+1→Ey，直至Ex=Ey为止。Ex＜Ey，则Mx右移。每右移一位，Ex+1→Ex，直至Ex=Ey为止。
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