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This is one usage I found in a open source software.And I don’t understant how it works.
when I ouput it to the stdout,it was “version 0.8.0”.
const char version[] = " version " "0" "." "8" "." "0";
This is a basic feature of both C89 and C++98 called ‘adjacent string concatenation’ or thereabouts.
Basically, if two string literals are adjacent to each other with no punctuation in between, they are merged into a single string, as your output shows.
In the C++98 standard, section §2.1 ‘Phases of translation [lex.phases]’ says:
This is after the preprocessor has completed.
In the C99 standard, the corresponding section is §5.1.2.1 ‘Translation Phases’ and it says:
The wording would be very similar in any other C or C++ standard you can lay hands on (and I do recognize that both C++98 and C99 are superseded by C++11 and C11; I just don’t have electronic copies of the final standards, yet).