Question about evaluating the arguments of printf (maybe OT?)

From: Edith Gross (egrossde_at_yahoo.de)
Date: 11/02/03 

Date: Sun, 02 Nov 2003 09:34:01 +0100

Let us assume, f1(char *buf) and f1(char *buf) are two functions that
as a side effect calculate a string. The string will be placed in buf and
buf is returned by both f1 and f2.

Should this work:

char buf[100];
fprintf(fp,"%s%s",f1(buf),f2(buf));

Or should I take two different buffers, that is

char buf1[100],buf2[100];
fprintf(fp,"%s%s",f1(buf1),f2(buf2));

TIA,
EG

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