%{
#include <stdio.h>
 
int pi = 0, ni = 0, pf = 0, nf = 0;
%}
 
%%
 
[-][0-9]+              { ni++; }             // negative integers
[+]?[0-9]+             { pi++; }             // positive integers
[-][0-9]*\.[0-9]+      { nf++; }             // negative fractions
[+]?[0-9]*\.[0-9]+     { pf++; }             // positive fractions
 
.                      ;                     // ignore everything else
 
%%
 
int yywrap() { return 1; }
 
int main(int argc, char *argv[])
{
    if (argc != 2)
    {
        printf("Usage: ./a.out input.txt\n");
        return 0;
    }
 
    yyin = fopen(argv[1], "r");
    yylex();
 
    printf("Number of positive integers: %d\n", pi);
    printf("Number of negative integers: %d\n", ni);
    printf("Number of positive fractions: %d\n", pf);
    printf("Number of negative fractions: %d\n", nf);
 
    return 0;
}
 

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