第章 计算机的信息表示-英文-第二次课.pptVIP

Chapter 2 The representation of information in a computer 2.1 Date types representing information in a computer 2.2 Representation of fixed-point unsigned numbers 2.3 Representation of fixed-point signed numbers 2.4 Binary addition/subtraction 2.5 Other code systems using bit strings Chapter 2 The representation of information in a computer Data types in a computer system: file, graph, table, tree, array, queue, linked list, stack, vector, string, real, integer, Boolean, char This chapter makes no attempt to discuss the representations of all kinds of information. It provides a basic introduction to representing information. Chapter 2 The representation of information in a computer Chapter 2 The representation of information in a computer Principles to decide which data types are implemented by data representation: 1．Reduce the running time of program 2．Reduce the communication cost between CPU and memory 3．Universality and Utilization 2.1 Data types representing information in a computer Binary variables and binary codes serve as the basis for representing information In order to represent different types of information, we need to apply different methods and systems of representation utilizing binary digits. Unsigned numbers Signed numbers Bit string 2.1 Data types representing information in a computer Unsigned numbers：are created directly as ordinary binary codes Operation codes in the OP code field Register numbers in address field Memory address counter Time, clock frequency 不需要正负符号表示！！！ 2.1 Data types representing information in a computer Signed number Numerical and engineering computation Most arithmetic operations in the instruction set handle signed integers or floating-point numbers as their operands. bit string（has an even wider application） logic operations in the instruction set Denote symbols such as characters In control unit of a computer, for examp