- Compiler Design Tutorial
– Many software having a complex front-end may need techniques used in compiler design. A symbolic equation solver which takes an equation as input. That program should parse the given input equation. – Most of the techniques used in compiler design can be used in Natural Language Processing (NLP) systems. System Software is a set of programs that manage the resources of a compute system. System Software is a collection of system programs that perform a variety of functions. File Editing Resource Accounting I/O Management Storage, Memory Management access management. System Software can be broadly classified into three types as. Chapter 5 Compilers System Software Chih-Shun Hsu Basic Compiler Functions Three steps in the compilation process scanning parsing, and code generation The task of. – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 491cba-NmNhM.
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Syntax analyzers follow production rules defined by means of context-free grammar. The way the production rules are implemented (derivation) divides parsing into two types : top-down parsing and bottom-up parsing.
Top-down Parsing
When the parser starts constructing the parse tree from the start symbol and then tries to transform the start symbol to the input, it is called top-down parsing.
Recursive descent parsing : It is a common form of top-down parsing. It is called recursive as it uses recursive procedures to process the input. Recursive descent parsing suffers from backtracking.
Backtracking : It means, if one derivation of a production fails, the syntax analyzer restarts the process using different rules of same production. This technique may process the input string more than once to determine the right production.
Bottom-up Parsing
As the name suggests, bottom-up parsing starts with the input symbols and tries to construct the parse tree up to the start symbol.
Example:
Input string : a + b * c
Production rules:
Let us start bottom-up parsing
Read the input and check if any production matches with the input:
- Computer Fundamentals
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Software is a set of programs, which is designed to perform a well-defined function. A program is a sequence of instructions written to solve a particular problem.
There are two types of software −
- System Software
- Application Software
Machine Independent Compiler Features In System Software Ppt
System Software
Machine Dependent Compiler Features In System Software Ppt
The system software is a collection of programs designed to operate, control, and extend the processing capabilities of the computer itself. System software is generally prepared by the computer manufacturers. These software products comprise of programs written in low-level languages, which interact with the hardware at a very basic level. System software serves as the interface between the hardware and the end users.
Some examples of system software are Operating System, Compilers, Interpreter, Assemblers, etc.
Here is a list of some of the most prominent features of a system software −
- Close to the system
- Fast in speed
- Difficult to design
- Difficult to understand
- Less interactive
- Smaller in size
- Difficult to manipulate
- Generally written in low-level language
Application Software
Application software products are designed to satisfy a particular need of a particular environment. All software applications prepared in the computer lab can come under the category of Application software.
Application software may consist of a single program, such as Microsoft's notepad for writing and editing a simple text. It may also consist of a collection of programs, often called a software package, which work together to accomplish a task, such as a spreadsheet package.
Examples of Application software are the following −
- Payroll Software
- Student Record Software
- Inventory Management Software
- Income Tax Software
- Railways Reservation Software
- Microsoft Office Suite Software
- Microsoft Word
- Microsoft Excel
- Microsoft PowerPoint
Features of application software are as follows −
- Close to the user
- Easy to design
- More interactive
- Slow in speed
- Generally written in high-level language
- Easy to understand
- Easy to manipulate and use
- Bigger in size and requires large storage space