Question

Write a program lex specification to implement lexical anasysis phase of compiler to count number of wors,lines and characters of given input file in java

Answer 1

ANSWER
............



int ch=0,

bl=0,

ln=0,

wr=0;

%}

%%

[\n] {ln++;wr++;}




[\t] {bl++;wr++;}

[" "



] {bl++;wr++;

}



[^\n\t] {ch++;}




%%



int main()

{

FILE *fp;

char file[10];

printf

("Enter the filename: ");

scanf("%s", file);

yyin=fp;

yylex();

printf(



"Character=%d\nBlank=%d\nLines=%d\nWords=%d", ch, bl, ln, wr);

return 0;

}

Output ->

$cat > input
Girish rao salanke


$lex p1a.l

$cc lex.yy.c –ll

$./a.out

Enter the filename: input
Character=16
Blank=2
Lines=1
Word=3