dizmox Wrote:

unauthorized Wrote:Or you could do it in C:

Code:

char* to12htime(int time24, int min)
{
    if(time24 < 0 || time24 > 23) return NULL;
    if(min < 0 || min > 60) return NULL;
    char* tstr = malloc(9);
    if(time24 > 12) sprintf(tstr, "%d:%d PM", time24-12, min);
    else sprintf(tstr,"%d:%d AM", time24, min);
    return tstr; // remember kids, never return dynamic buffers like this ;)
}

Now, you can call to12htime() every time you need to convert. Remember to check that return value. And free the returned buffer when you are done with it.

I'll cheat and use Matlab.

Code:

mod(hour,12)

pm215 Wrote:(waaay off topic, but) *blink*. If you want to make the program exit on malloc failure then wrap malloc. If you don't check you don't get a crash, you get undefined behaviour, and you never want that. (If you're really unlucky you get undefined behaviour which is a security hole.)

unauthorized Wrote:Actually, any attempt to reference data by a NULL pointer would be caught by the CRT as per the standard specifications. This is one of the few security features in C.

C99 standard section 6.5.3.2 paragraph 4 Wrote:The unary * operator denotes indirection. [...] If an
invalid value has been assigned to the pointer, the behavior of the unary * operator is
undefined.(90)

C99 footnote 90 Wrote:Among the invalid values for dereferencing a pointer by the unary * operator are a null pointer, an address inappropriately aligned for the type of object pointed to, and the address of an object after the end of its lifetime.

pm215 Wrote:The C standard disagrees with you:
........
Just because most C runtimes happen to make NULL pointer dereferences crash doesn't mean they are obliged to by the standard. In an embedded environment it's quite plausible that they will not be caught but instead you'll just scribble on low memory.

pm215 Wrote:The implementation is entirely at liberty to start nethack or cause demons to fly out of your nose or anything else it feels like.

Quote:@Daichi, dizmox: I thought it was bluntly obvious that I was trying to use the most pointlessly long way to do it. Why else would I use C?