What does printf (_ ("hello, world \ n")) mean?

Question

What is the role of the argument _ ("hello, world \ n") for printf / puts, etc.? I often find it when reading the GNU source code.

Answer 1

See GNU Gettext - it ( _(...) ) is used as a "binding site" for translation.

Answer 2

This is the gettext internationalization system.

Answer 3

this is a macro that replaces the gettext translation function. For a detailed explanation in gettext, check out this entry: http://oriya.sarovar.org/docs/gettext_single.html

Answer 4

The underline function (or macro) is a custom function defined by any project you are looking at. By convention, he decided to send the GNU Gettext string to get a translated version of the string for the user's current language.

This use of the _ macro is described in the overview , which is contained in the GNU Gettext manual.