%{
#include <stdio.h>
%}
 
%%
[0-9]+          { printf("NUMBER: %s\n", yytext); }
[+]             { printf("PLUS: %s\n", yytext); }
[-]             { printf("MINUS: %s\n", yytext); }
[*]             { printf("MULTIPLY: %s\n", yytext); }
[/]             { printf("DIVIDE: %s\n", yytext); }
[ \t\n]+        { /* Ignore whitespace */ }
.               { printf("INVALID CHARACTER: %s\n", yytext); }
%%
 
int main() {
    printf("Enter an arithmetic expression:\n");
    yylex();
    return 0;
}
 
int yywrap() {
    return 1;
}
 
 

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