Sandeep Hegde

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System Software Lab Programs ( Lex and Yaac Programs )exa

// February 21st, 2009 // Engineering, Unix and System Software Lab

Subject : System Software Laboratory

Branch : Information Science & Engineering

Semester : 6

University : VTU

………………………………………………………………………………………………………………………….
PART – A

………………………………………………………………………………………………………………………….

1 a) Lex Program to count the number of characters, words, spaces and lines in a given input file.

% {

#include<stdio.h>
int (cc=0,lc=10,wc=0,sc=0)

% }

[^ \t \n]+ {wc++;cc+=yyleng;}
[/t]      {sc++;}
\n        {lc++}

%%

main(int arg c, char * argv[])
{
FILE * file;
if(argc>1)

file=fopen(argv[1],”r”);
if(!file)
{
printf(“Could not open file ;
exit(1);
}
yyin=file;
}
yylex();

printf(“\n Number of Spaces = %d “,sc);
printf(“\n Number of Words = %d “,wc);
printf(“\n Number of Characters = %d “,cc);
printf(“\n Number of Lines  = %d “,lc);

return 0;

}

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SAMPLE OUTPUT

…………………………………………………………………………………….

FILE CONTENT :

HELLO WORLD,

WELCOME TO MY FIRST LEX PROGRAM

PROGRAM OUTPUT :

Number of Spaces = 6

Number of Words = 8
Number of Characters = 38
Number of Lines  = 2

 

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