论文资料-----计算机应用软件外文翻译资料

论文资料-----计算机应用软件外文翻译资料内容摘要：

1 easy operation memory。 Letter L (used as load) than 01011000 easy memory. Operate with few signs at A, B and C, replacing the main memory address number, this also simplifies the code. Unfortunately there is no direct implementation of the puter assembly language instructions. Write x87 code programmers can simplify the work, but the puter is a binary machine for binary instructions, requiring translation. Read procedures assembler source code, the source statement translated into binary, a target module. Because the module is the goal of the program source code machineclass version. Therefore, it can be installed in the main memory and to implement them. Members of assembly language programming instructions for each machine to write a x87 instructions. Because pilation machinery orders and instructions between 一一对应 relations, assembly language and machine language are dependent on machines, as a puter model prepared by the procedure can not be another type of machine implementation. In a given machine, the assembly language as far as possible, have the most direct and effective process, often using it to write the operating system or other system software. However, when it applied to applications, rely on machines attributes is to pay a high price for efficiency, so applications rarely use assembly language to write. piler and interpreter In order to add two numbers, the puter needs 104 machine instructions. Because this is the work of the puter method. Human beings do not have the same manner as puters, programmers simply specified boosting using other instructions on the roll, for example, is a way of the addition as an algebraic expression: C = A + B Why do they not allow programmers using algebraic expressions similar to the form of written statements? And why not the source of these statements made in the proceedings, and procedures necessary for native? This is the piler sure to be pleted. Many programming languages, including Fortran, BASIC, PASCAL, PL / 1 and ALGOL are based on the algebraic expression. Businessoriented COBOL language most monly used language similar to the requirements of the short English phrases. However, it must be recalled that, It does not matter what language, the target is the same. Programmers for source, assembler accept x87 source procedures, and produce machines goals module。 FORTRAN piler accept FORTRAN source, also produced machines goals module。 COBOL piler accept COBOL source code, the goals have ibid. module. The pilation process and the difference between the piler? For assembler, every source query has been converted into a machine instructions. But piler, a source statements can be converted arbitrary number of machine instructions. Another option is to adopt the interpretation of the procedures. The pilation process and procedures are piled into a plete reading of the source files, and produce a plete module targets. On the other hand, only the interpretation of the procedures each operation of a source statement, read it, put it into machine instructions, implementation is converted into binary instructions, and then proceed to the next source of a statement. Compiler procedures and the interpretation of the procedures both produce machine instructions, but the process is different. Each language has its own grammar, punctuation and spelling rules. PASCAL source such as the COBOL piler or BASIC interpreter。