lex_by_file( FileName ) :-
get_input_from_file( FileName, TokenList ),
lex( TokenList, OutputList ),
%write_output( OutputList ), !.
maplist(writeln,OutputList),!.
%% atom_number(atom, number)
lex([],[]).
lex(['int' | T], ['TYPE: int' | R]) :- lex(T, R).
lex(['bool' | T], ['TYPE: bool'] | R) :- lex(T, R).
lex([',' | T], ['COMMA: ,'] | R) :- lex(T, R).
lex([X | T], [X | R]) :- lex(T, R).
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%{
#include <stdio.h>
%}
%%
[0-9]+ {
int num = atoi(yytext);
int factorial = 1;
for (int i = 1; i <= num; i++) {
factorial *= i;
}
printf("Factorial of %d is %d\n", num, factorial);
}
.|\n ;
%%
int main() {
yylex();
return 0;
}