Tuesday, March 1, 2016

LEX program to convert uppercase to lowercase except inside comments




%{
/* LEX program to convert uppercase to
   lowercase except inside comments
*/
#include <stdio.h>
#include <stdlib.h>
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE 1
#endif
%}
%option noyywrap
%%
[A-Z] {
putchar(tolower(yytext[0]));
/* yytext[0] is the single
  uppercase char found */
}
"/*" {
char c;
int done = FALSE;
ECHO;
do {
while ((c = input()) != '*')
putchar(c);
putchar(c);
while ((c = input()) == '*')
putchar(c);
putchar(c);
if (c == '/') done = TRUE;
} while (!done);
}
%%
int main() { yylex(); return 0; }

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