%{
#include <stdio.h>
%}
 
%%
[0-9]+                  { printf("NUMBER\n"); }
[a-zA-Z_][a-zA-Z0-9_]*  { printf("IDENTIFIER\n"); }
"+"|"-"|"*"|"/"         { printf("OPERATOR\n"); }
"="                     { printf("ASSIGNMENT\n"); }
[ \t\n]+                ;     /* Ignore whitespace */
.                       { printf("INVALID\n"); }
%%
 
int yywrap()
{
    return 1;
}
 
int main()
{
    printf("Enter input:\n");
    yylex();
    return 0;
}
 

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