LEX program to check the syntax of SCANF statement

%{
#include<stdio.h>
#include<ctype.h>
int i=0,j=0;
%}a "%d"|"%f"|"%c"|"%s"
id [a-zA-Z][a-zA-Z0-9]*
%%
scanf\((\"({a}*|.*)*\"(,\&{id})*\))\;
{for(i=0;i<yyleng;i++)
{if(yytext[i]=='%')
j++;
if(yytext[i]==',')
j--;
}
if(j==0)
printf("Correct");
else
printf("Incorrect");
}
%%
main()
{ yyin=fopen("sample.c","r");
yylex();
}
int yywrap()
{
return 1;
}        

Posted in: Language processing programs , LEX Programs