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Assignment 1: Problem Description In this assignment, your job is to program a simple lexical analyzer that will build a symbol table from given stream of chars. You will need to read a file named "input.txt" to collect all chars. For simplicity, input file will be a C program without headers and methods. Then you will identify all the numerical values, identifiers, keywords, math operators, logical operators and others   [distinct]. See the example for more details. You can assume that, there will be a space after each keywords. But, removal of space will add bonus point. Lab 1: Activity List Task 1: For the following sample program find all the tokens. Note that a lexical Analyzer is responsible for Scan Input Remove WS, NL, ... Identify Tokens Create Symbol Table (ST) Insert Tokens into ST Generate Errors Send Tokens to Parser Fig 1: Lexical Analyzer Input: int a, b, c; float d, e; a = b = 5; c = 6; if ( a > b) { c = a - b; e = d - 2.0; } else { d = e + 6.0; b = a + c; } Output: Keywords: int, float, if, else Identifiers: a, b, c, d, e Math Operators: +, -, = Logical Operators: > Numerical Values: 5, 6, 2.0, 6.0 Others: , ; ( ) { }

Assignment 1: Problem Description In this assignment, your job is to program a simple lexical analyzer that will build a symbol table from given stream of chars. You will need to read a file named "input.txt" to collect all chars. For simplicity, input file will be a C program without headers and methods. Then you will identify all the numerical values, identifiers, keywords, math operators, logical operators and others   [distinct]. See the example for more details. You can assume that, there will be a space after each keywords. But, removal of space will add bonus point. Lab 1: Activity List Task 1: For the following sample program find all the tokens. Note that a lexical Analyzer is responsible for Scan Input Remove WS, NL, ... Identify Tokens Create Symbol Table (ST) Insert Tokens into ST Generate Errors Send Tokens to Parser Fig 1: Lexical Analyzer Input: int a, b, c; float d, e; a = b = 5; c = 6; if ( a > b) { c = a - b; e = d - 2.0; } else { d = e + 6.0; b = a + c; } Output: Keywords: int, float, if, else Identifiers: a, b, c, d, e Math Operators: +, -, = Logical Operators: > Numerical Values: 5, 6, 2.0, 6.0 Others: , ; ( ) { }

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Assignment 1: Problem Description

In this assignment, your job is to program a simple lexical analyzer that will build a symbol table from given stream of chars. You will need to read a file named "input.txt" to collect all chars. For simplicity, input file will be a C program without headers and methods. Then you will identify all the numerical values, identifiers, keywords, math operators, logical operators and others

 

[distinct]. See the example for more details. You can assume that, there will be a space after each keywords. But, removal of space will add bonus point.

Lab 1: Activity List

Task 1: For the following sample program find all the tokens.

Note that a lexical Analyzer is responsible for

  1. Scan Input
  2. Remove WS, NL, ...
  3. Identify Tokens
  4. Create Symbol Table (ST)
  5. Insert Tokens into ST
  6. Generate Errors
  7. Send Tokens to Parser

Fig 1: Lexical Analyzer

Input: int a, b, c;

float d, e;

a = b = 5;

c = 6;

if ( a > b)

{

c = a - b;

e = d - 2.0;

}

else

{

d = e + 6.0;

b = a + c;

}

Output:

Keywords: int, float, if, else

Identifiers: a, b, c, d, e

Math Operators: +, -, =

Logical Operators: >

Numerical Values: 5, 6, 2.0, 6.0

Others: , ; ( ) { }

token lexical source аnalyzer parser program get next token symbol table Fig 1: Lexical Analyzer
Transcribed Image Text:token lexical source аnalyzer parser program get next token symbol table Fig 1: Lexical Analyzer
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