for循环中的C预处理程序串联

Question

Is it possible to use concatenation in a for loop? My code snippet is like this:

#define CONCATE(a, b) a ## b
#define CALL_SEARCH(n, x, y) search(n, arg1, arg2, x, y)
...
int i;
for (i = 1; i (less than or equal to) number; ++i)
{
    results = CALL_SEARCH(CONCATE(f, i), tol, max_tries);
}

What I want to do in this for loop is like this:

search(f1, arg1, arg2, tol, max_tries)

search(f2, arg1, arg2, tol, max_tries)

...

I know my version is obviously wrong but that's the result I want to archive.

EDIT:

I decided not to use macro for this.

Answer 1

CONCATENATE creates " fi ", not " f1 ". You want f to be an array and use i as an index on it.

Answer 2

Preprocessing is only text replacement which is done before compiling. At this stage, we therefore don't know the value of int i .

If you wish to concatenate the text string "f" and the value of i at runtime, you may do this:

char buf[10];
snprintf(buf, 10, "f%i", i);

and then

CALL_SEARCH(buf, ...)