%{
#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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

cHJpbnRmCmBgMTIzNA==

printf
``1234