%{
#include <stdio.h>
%}
 
/* Definitions */
NUMBER      [0-9]+(\.[0-9]+)?   /* integers or decimals */
WS          [ \t]+              /* whitespace */
 
%%
 
{WS}        ;                               /* ignore whitespace */
{NUMBER}    { printf("NUMBER(%s)\n", yytext); }
"+"         { printf("PLUS(+)\n"); }
"-"         { printf("MINUS(-)\n"); }
"*"         { printf("MULT(*)\n"); }
"/"         { printf("DIV(/)\n"); }
"("         { printf("LPAREN(()\n"); }
")"         { printf("RPAREN())\n"); }
.           { printf("UNKNOWN(%s)\n", yytext); }
 
%%
 
int main() {
    printf("Enter an arithmetic expression:\n");
    yylex();
    return 0;
}
 
int yywrap() {
    return 1;
}
 

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