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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 1 A

Write a LEX program to recognize valid arithmetic expression. Identifiers in the expression could be only integers and operators could be + and *. Count the identifiers & operators present and print them separately.

Download the Program - code

%{
#include<stdio.h>
int v=0,op=0,id=0,flag=0;
%}

%%
[0-9][0-9]* {id++;printf("\nIdentifier:");ECHO;}
[\+\-\*\/\=] {op++;printf("\nOperartor:");ECHO;}
"(" {v++;}
")" {v--;}
";" {flag=1;}
.|\n {return 0;}
%%

int main()
{
	printf("Enter the expression:\n");
	yylex();
	if((op+1) ==id && v==0 && flag==0)
	{
		printf("\n\nIdentifiers are:%d\nOperators are:%d\n",id,op);
		printf("\nExpression is Valid\n");
	}
	else
		printf("\nExpression is Invalid\n");
	return 1;
}
int yywrap()
{
	return 1;
}

Output

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