[Dev-C++] Reading and printing long double values

Dear users,

   I´m having some problems trying to read/print
a long double value in C.

   Based on a documentation I´ve found, one of the
attempts was:

   ...
   long double var=3.0;
   ...
   printf("printing a long double value-->%5.0Lg\n", var);
   ...

   I´ve already tested: %LE and %LF and none of these
options worked.

   Does anybody know how to read and print?
   Thanks!

Andre

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09:39