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Old 05-18-2006, 10:12 PM   #1
bbengg
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Post How can I support 64bit data type?


Hello!

I need to support 64bit data type(like int64)with gcc compiler. Is there any option to do this?

thank you.
 
Old 05-19-2006, 05:22 AM   #2
pxumsgdxpcvjm
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It's called "long long". The unsigned version is called (obviously) "unsigned long long".
Thus if you have declared "long long n", then n can store values in [-2^63,2^63) (signed), or in [0,2^64) (unsigned).

If you're using C, then "long long" is part of the standard (C99) and is the official name for it.
If you're using C++, then C++ has no standard 64-bit integer datatype, but most compilers support it. The M$ compilers call it int64, I guess, and gcc calls it "long long". (Also, it is quite likely that 64-bit integer datatypes will become part of the C++ standard the next time a standard is discussed, and it will be called long long.)
 
Old 05-21-2006, 11:22 PM   #3
bbengg
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Thank you for your help!!
The long long data type works well in my system.
But it takes some time to verify it.
Because I cannot print long long data type using "printf()" function.
I think printf() do not support long long data type. So, I print it using bit shift like below. ^^

unsigned long long value ;
value = 0xffffffffff;
printf("value %08x%08x\n", (int)(value>>32), (int)value);
 
Old 05-21-2006, 11:58 PM   #4
daihard
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Location: Seattle, WA
Distribution: Kubuntu 14.04 LTS
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Quote:
Originally Posted by bbengg
Thank you for your help!!
The long long data type works well in my system.
But it takes some time to verify it.
Because I cannot print long long data type using "printf()" function.
I think printf() do not support long long data type. So, I print it using bit shift like below. ^^

unsigned long long value ;
value = 0xffffffffff;
printf("value %08x%08x\n", (int)(value>>32), (int)value);
The "%lld" (or "%llu" for unsigned) format specifier should work. Have you tried it?

Last edited by daihard; 05-22-2006 at 12:00 AM.
 
Old 05-22-2006, 12:32 AM   #5
bbengg
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Thanks a lot.
That specifier works well.

I have a question. I cannot find that specifer by using "man" and "info" command.
Where can i find it in detail? I hope I can find it in web site.

Thanks.
 
Old 05-22-2006, 12:40 AM   #6
daihard
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Quote:
Originally Posted by bbengg
Thanks a lot.
That specifier works well.

I have a question. I cannot find that specifer by using "man" and "info" command.
Where can i find it in detail? I hope I can find it in web site.
I found those specifiers in the man page.

Simply running "man printf" yields information on the shell printf command. Try running "man 3 printf" instead.
 
Old 05-22-2006, 03:55 AM   #7
bbengg
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You are right. I checked it. Thanks you
 
Old 05-23-2006, 12:04 AM   #8
daihard
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Distribution: Kubuntu 14.04 LTS
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Quote:
Originally Posted by bbengg
You are right. I checked it. Thanks you
You're welcome. Glad I was able to help.
 
  


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