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%{ /* Recognising ckeyword */ #include %} %% [\t ]+ auto | break | char | case | const | continue | default | do | double | else | does | enum | extern | float | goto | int | long | registe

%{ #include %} %% [1-9][0-9][0-9]([0]|[5]) {printf("divisible by 5");} . {} %% int yywrap(void) { return 1; } int main(void) { yylex(); return 0; }

%{ /* example for verb and article */ %} #include %% [\t ]+ auto break | char | case | const | continue | default | do | double | else | does | enum | extern | float | for | goto | if | int

%{ #include %} %% auto | break | case | char | const | continue | default | do | double | else | enum | extern | float | for | goto | if | int | long | register | return | short | signed

%{ #include %} %% [0-9]+[_]*[a-zA-Z]* printf("It is not an identifier\n",yytext); [_]*[a-zA-Z]*[_]*[a-zA-Z0-9]* printf("It is a identifier\n",yytext); %%

%{ #include %} %% [0-9]*[.][0-9]+ printf("%s is float number",yytext); [0-9]+ printf("%s is not a float number",yytext); [.]+ printf("%s is not a valid input",yytext); %%

%% %% int yywrap(void) { return 1; } int main(void) { yylex(); return 0; }

%{ #include #include #include #include #define YYSTYPE double #include "y.tab.h" extern YYSTYPE yylval; %} digit [0-9] space [ \t] %% {space}