Editing C syntax (section)

====String literal concatenation====
C has [[string literal concatenation]], meaning that adjacent string literals are concatenated at compile time; this allows long strings to be split over multiple lines, and also allows string literals resulting from [[C preprocessor]] defines and macros to be appended to strings at compile time:
<syntaxhighlight lang=C>
    printf(__FILE__ ": %d: Hello "
           "world\n", __LINE__);
</syntaxhighlight>
will expand to
<syntaxhighlight lang=C>
    printf("helloworld.c" ": %d: Hello "
           "world\n", 10);
</syntaxhighlight>
which is syntactically equivalent to
<syntaxhighlight lang=C>
    printf("helloworld.c: %d: Hello world\n", 10);
</syntaxhighlight>