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, Sep 02 '13 at 13:34
Check the double stringify trick here: [Stringify macros](http://stackoverflow.com/questions/2751870/how-exactly-does-the-double-stringize-trick-work) — pablo1977, Sep 02 '13 at 20:09

not-a-user · Accepted Answer · 2016-05-10T15:36:20.780

3

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

edited May 10 '16 at 15:36

answered Jan 08 '15 at 16:28

not-a-user

1

Caution : underscore-prefixed identifiers are reserved for the implementation. – Quentin May 03 '16 at 14:21

score 0 · Answer 2 · answered Sep 02 '13 at 13:35

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 02 '13 at 13:35

No Idea For Name

Literal strings concatenation required here but not dynamic arrays copying – dyomas Dec 21 '16 at 14:30

2 Answers2