%{
#include<stdio.h>
#include<string.h>
%}
 
%%
"int"|"float"|"char"|"double"     { printf("Keyword: %s\n", yytext); }
[0-9]+                            { printf("Number: %s\n", yytext); }
[a-zA-Z_][a-zA-Z0-9_]*            { printf("Identifier: %s\n", yytext); }
"+"|"-"|"*"|"/"                   { printf("Operator: %s\n", yytext); }
"="                                { printf("Assignment Operator: %s\n", yytext); }
";"                                { printf("Semicolon\n"); }
[ \t\n]+                           { /* Ignore whitespace */ }
.                                   { printf("Invalid: %s\n", yytext); }
%%
 
int main()
{
    printf("Enter the input:\n");
    yylex();
    return 0;
}
 
int yywrap()
{
    return 1;
}

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