Concatenate C macro definition string to literal strings

Question

Let the first row be:

#define TAG_LEN 32

Now, I need to concatenate it with a literal string constant; something like that:

puts("Blah" [insert your answer] TAG_LEN); // I need "Blah32".

32 is not a string, so that won't work. You're going to have to call a macro to do the magic. — unwind
– unwind, Commented Sep 2, 2013 at 13:34

not-a-user · Accepted Answer · 2016-05-10 15:36:20Z

3

#define STR_NOEXPAND(tokens) # tokens
#define STR(tokens) STR_NOEXPAND(tokens)
puts("Blah" STR(TAG_LEN));

answered Jan 8, 2015 at 16:28

not-a-user

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1 Comment

Caution : underscore-prefixed identifiers are reserved for the implementation.

No Idea For Name · Accepted Answer · 2013-09-02 13:35:14Z

0

you can do:

printf("Blah%d", TAG_LEN);

or if you have a string

char *yourString;// initiate it with your value

printf("Blah%s%d",yourString, TAG_LEN);

answered Sep 2, 2013 at 13:35

No Idea For Name

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Literal strings concatenation required here but not dynamic arrays copying