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SYSTEM SOFTWARE AND OPERATING SYSTEM LABORATORY

[As per Choice Based Credit System (CBCS) scheme]

(Effective from the academic year 2017 - 2018)

SEMESTER - VI

Subject Code 17CSL67

IA Marks 40

Number of Lecture Hours/Week 01I + 02P

Exam Marks 60

17CSL67 - SYSTEM SOFTWARE AND OPERATING SYSTEM LABORATORY

Program 6 A

Write a LEX program to eliminate comment lines in a C program and copy the resulting program into a separate file.

Download the Program - code

%{
#include<stdio.h>
int sl=0;
int ml=0;
%}
%%
"/*"[a-zA-Z0-9' '\t\n]+"*/"	ml++;
"//".*	sl++;
%%

main()
{
	yyin=fopen("f1.c","r");
	yyout=fopen("f2.c","w");
	yylex();
	fclose(yyin);
	fclose(yyout);
	printf("\n Number of single line comments are = %d\n",sl); printf("\nNumber of multiline comments are =%d\n",ml);
}

Output

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