Re: Suggested method for returning a string from a C program?

Michael S <already5chosen@yahoo.com> writes:

On Thu, 20 Mar 2025 15:16:05 -0000 (UTC)
Muttley@DastardlyHQ.org wrote:

On Thu, 20 Mar 2025 16:59:14 +0200
Michael S <already5chosen@yahoo.com> wibbled:

On Thu, 20 Mar 2025 14:50:25 -0000 (UTC)
Muttley@DastardlyHQ.org wrote:
 

 
What makes you think they're macros?
 

>
PRIu64 and PRId64 are macros. They are ugly. 

 
Never even heard of them. Looking them up I can't see much use for
them frankly except if you're starting out on an unknown system and
can't find out the info any other way which would be ... odd.

>
Then how exactly do you printf value of type int64_t in a code that
expected to pass [gcc] compilation with no warnings on two platforms,
one of which is 64-bit Unix/Linux and another is just about anything
else?

#include <stdint.h>
#include <stdio.h>
int main(void) {
    int64_t n = 42;
    printf("%ju\n", (intmax_t)n);
}

The alternative is:

#include <stdint.h>
#include <inttypes.h>
#include <stdio.h>
int main(void) {
    int64_t n = 42;
    printf("%" PRId64 "\n", n);
}

I was able to write the first from memory.  I had to consult the
standard for the second, though I'm sure I'd be able to remember it if I
used it more often.

--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */