%{
#include <stdio.h>
%}
 
%option noyywrap
 
%%
[0-9]+          { printf("Number: %s\n", yytext); }
[+\-*/]         { printf("Operator: %s\n", yytext); }
[a-zA-Z][a-zA-Z0-9]* { printf("Identifier: %s\n", yytext); }
[ \t\n]         ; /* Ignore whitespace */
.               { printf("Invalid character: %s\n", yytext); }
%%
 
int main() {
    printf("Enter an arithmetic expression: ");
    yylex(); // Process the input
    return 0;
}
 
int yywrap() {
    return 1;
}
 

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