Unsigned int - High Level Programming

nimnod · #1 (**permalink**) 03-02-2002

How can I store and/or print() a number that is larger than 4 294 967 295 in C? is int64_t or u_int64_t what I need ? if, so how can I printf it to stdout?

Perderabo · #2 (**permalink**) 03-02-2002

On HP-UX, this program works:

Code:

#include<stdlib.h>
#include<stdio.h>
main()
{
         long i;
         i=5000000000;
         printf("i = %ld \n", i);
          exit (0);
}

To get this to work I had to specify the +DD64 option on the cc command. HP's compiler defaults to 32 bit mode.

This page says:

Quote:

The HP-UX 64-bit data model is called LP64 because longs and pointers are 64 bits. In this model, ints remain 32 bits.

The LP64 data model is the emerging standard on 64-bit UNIX systems provided by leading system vendors. Applications that transition to the LP64 data model on HP-UX systems are highly portable to other LP64 vendor platforms.

AtleRamsli · #3 (**permalink**) 03-03-2002

I wasn't sure is this was HP-UX specific, there is a weirdicious feature in GCC that will make the aforementioned program work with two changes (at least under Linux)

Use data type

long long l; /* Not typo! will compile */

and printf("%Ld", l); /* Notice capital L */

If GCC is used on various Os'es, it should work.
(I just checked on Solaris, it prints 1 :-(

Atle

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