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LEX program to identify the number is Even or Odd.



/* declaration section in this sections we will declare the different value and include the header file which we are using in this program to run this program */
%{
#include<stdio.h>
#include<stdlib.h>
int i;
%}

 /* defined section */

 %%
[0-9]+ {i=atoi(yytext); if(i%2==0) printf("Even !"); else printf("Odd !");}
%%

 int main()
{
yylex();

}

How to run this program 

          save the file as "even_odd.l"
          open terminal  and run    " flex  even_odd.l "
          it generates c file run      " cc lex.yy.c -o evenodd  -ll  "  as out put  in file count
          now run   for output       " ./evenodd"
         

Comments

  1. John Hughes22 January 2020 at 08:44

    That's dumb.

    Replace :

    [0-9]+ {i=atoi(yytext); if(i%2==0) printf("Even !"); else printf("Odd !");}

    By

    [0-9]*[02468] { printf ("Even!"); }
    [0-9]*[13579] {printf ("Odd!); }

    ReplyDelete
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