%{
#include<stdio.h>
%}
 
%%
"bool"|"int"|"float"|"char"|"if"|"else"|"while"|"for"|"do"|"continue"|"break"|"return"|"void"
                { printf("Keyword\n"); }
 
\/\/[^\n]*      { /* Ignore single line comment */ }
 
\/\*([^*]|\*+[^*/])*\*+\/
                { /* Ignore multi line comment */ }
 
[ \t\n]+        { /* Ignore spaces, tabs and newlines */ }
 
[0-9]+(\.[0-9]+)?
                { printf("Constant\n"); }
 
[A-Za-z_][A-Za-z0-9_]*
                { printf("Identifier\n"); }
 
"=="|"!="|"<="|">="|"++"|"--"|"&&"|"||"|[+\-*/%=<>!]
                { printf("Operator\n"); }
 
[(){};,]        { /* Ignore punctuation */ }
 
.               { /* Ignore other characters */ }
 
%%
 
int main()
{
    printf("Enter the input:\n");
    yylex();
    return 0;
}
 

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