软硬件系统编程PPT (13).pdf

计算机中的信息表示小结 Summary:Information representation in the computer After finishing this week's course, I hope you can answer... Why computers use binary numeral system? Besides numbers why can a computer understand other information? How are numbers, characters, music, and images represented on the computer? Since computers only understand binary, why do we need other numeral systems? How to represent the sign of a number in the computer? Why computers use complement? What is the main difference between a analog signal and a digital signal? After finishing this week's course, I hope E.g. For a two's you can understand... complement hex number A8H, is it positive or negative? Conversion methods between different numeral systems What is the Representation of original code, inverse code and corresponding complement decimal number? Arithmetic operations of machine numbers The process of converting from analog audio signals or continuous image signals to digital signals 3 Exercise 1. Suppose: X=1010010, Y=-1100110. Calculation: the original code, inverse code and complement of X and Y, and [X+Y] complement =? Solution: Because X>0, [X] original = [X] anti = [X] complement Because Y<0, [Y] original = [Y] anti = [Y] complement = [X+Y] complement =11101100 X+Y-10100B