Positive and Negative Numbers */ 
%{ 
int positive_no = 0, negative_no = 0; 
%} 
 
/* Rules for identifying and counting  
positive and negative numbers*/
%% 
^[-][0-9]+ {negative_no++;  
            printf("negative number = %s\n", 
                  yytext);}  // negative number 
 
[0-9]+ {positive_no++; 
        printf("positive number = %s\n",  
                 yytext);} // positive number      
%%  
 
/*** use code section ***/
 
int yywrap(){} 
int main()                                               
{ 
 
yylex();  
printf ("number of positive numbers = %d,"
        "number of negative numbers = %d\n", 
                positive_no, negative_no); 
 
return 0;  
}
 

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