%{ /*LEX program to count the number of: a) Positive and negative integers
b) Positive and negative fractions */
int zcnt=0, pcnt=0, ncnt=0, pfcnt=0, nfcnt=0;
%}
zero [+]?[0]+|[-][0]+|[+]?[0]\.[0]|[-][0]\.[0]
%%
{zero} { zcnt++; }
[+]?[0]*[1-9][0-9]* { pcnt++; }
[-][0]*[1-9][0-9]* { ncnt++; }
[+]?[0-9]*\.[0-9]+ { pfcnt++; }
[-][0-9]*\.[0-9]+ { nfcnt++; }
\n return;
%%
main()
{
printf("Enter nos separated by space: ");
yylex();
printf("No of zeros=%d\n", zcnt);
printf("No of positive integers=%d\n", pcnt);
printf("No of negative integers=%d\n", ncnt);
printf("No of positive fractions=%d\n", pfcnt);
printf("No of negative fractions=%d\n", nfcnt);
}

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