Database System Concepts
7th Edition
ISBN: 9781260084504
Author: Abraham Silberschatz, S. Sudarshan, Abraham, Henry Korth, Silberschatz Abraham, Silberschatz Professor
Publisher: McGraw-Hill Education
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Chapter 20, Problem 12PE
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Send me the lexer and parser
Here is my code please draw a transition diagram and nfa on paper
public class Lexer
{
private static final char EOF = 0;
private static final int BUFFER_SIZE = 10;
private Parser yyparser; // parent parser object
private java.io.Reader reader; // input stream
public int lineno; // line number
public int column; // column
// Double buffering implementation
private char[] buffer1;
private char[] buffer2;
private boolean usingBuffer1;
private int currentPos;
private int bufferLength;
private boolean endReached;
// Keywords
private static final String[] keywords = {
"int", "print", "if", "else", "while", "void"
};
public Lexer(java.io.Reader reader, Parser yyparser) throws Exception
{
this.reader = reader;
this.yyparser = yyparser;
this.lineno = 1;
this.column = 0;
// Initialize double buffering
buffer1 = new char[BUFFER_SIZE];
buffer2 = new char[BUFFER_SIZE];
usingBuffer1 = true;
currentPos = 0;
bufferLength = 0;
endReached = false;
// Initial buffer fill
fillBuffer();
}
private…
If integer x is divisible by 3, can you prove that ceil(x/2) + floor(x/6) = floor(x/2) + ceil(x/6)
Chapter 20 Solutions
Database System Concepts
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