Write a LEX / FLEX program to Request input ,validate input and check for Even / Odd / Decimal | Compiler Construction

LEX / FLEX program to Request input ,validate input and check for Even / Odd / Decimal:-

Here is the LEX/FLEX Program which takes a number as input after that it will validate the input and check whether it is even or odd or decimal.

Source Code of  Lex Program:-

%{

#include<stdio.h> 

int count = 0; 

%} 

ODD -?[0-9]*[13579]

EVEN -?[0-9]*[02468]

DECI -?[0-9]*.[0-9]

%% 

END {return 0;}

{ODD} {printf("Given Number is Odd"); } 

{EVEN} {printf("Given Number is Even");}

{DECI} {printf("Given Number is Decimal");}

[A-Za-z0-9\.]* {printf("Invalid Input");}

%% 

  

int yywrap(){} 

int main()

{ 

       printf("Enter a Number\n");

       yylex();

       return 0;  

}

Output of above Lex Program:-

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Final Word:-

In this article, We have explained to you how to write a LEX / FLEX program to Request input ,validate input and check for Even / Odd / Decimal . We hope you like it

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