Counting Number Of Comments lex Program

Compiler Construction Lab Manual / Counting Number Of Comments lex Program

Program Name

Write a Compiler Construction Program for Counting Number Of Comments lex Program.

Theory
Counting Number Of Comments lex Program

Program Code


%{
//#include<stdio.h>
int comments;
%}
start "/*"
end "*/"
%%
{start}(.)*{end} comments++;
%%
int main(int argc,char *argv[])
{
yyin=fopen(argv[1],"r");
yylex();
printf("no of comments are %d\n",comments);
fclose(yyin);
}
int yywrap(void){	return 1;	}

Saving: vi comments.l

Compiling and Running
lex comments.l
cc lex.yy.c
./a.out file3.c

Input
//Vi file3.c
/*hello*/
/*world*/
Hello
World

Output
Hello World no of comments are 2

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