Re: project euler 29

["Jeffrey R.Carter" <spam.jrcarter.not@spam.acm.org.not>]

On 2023-09-15 11:03, CSYH (QAQ) wrote:
> As I know integer type is for 32 bits. but for this problem as me to find out the 2 ** 100 and even 100 ** 100.

I missed this the first time.

No, you don't know that Integer is 32 bits. ARM 3.5.4 (21) 
[http://www.ada-auth.org/standards/aarm12_w_tc1/html/AA-3-5-4.html] requires

"In an implementation, the range of Integer shall include the range –2**15+1 .. 
+2**15–1."

There are compilers for which Integer is less than 32 bits, so assuming 
otherwise is not portable. I know a lot of people don't care about portability, 
but I've also seen projects that spent large sums porting code that they thought 
didn't have to be portable. The cost of writing portable code is usually much 
smaller than the cost of porting non-portable code.

Of course, you can always declare your own integer type with whatever range is 
appropriate for your problem, though the compiler doesn't always have to accept 
it. I don't know any compiler that doesn't accept 32-bit integer declarations, 
nor any targeting 64-bit platforms that doesn't accept 64-bit integers. But 
you're unlikely to find a compiler that will accept

range 2 .. 101 ** 101

In King (https://github.com/jrcarter/King) the compiler must accept all integer 
type declarations.

-- 
Jeff Carter
"I didn't squawk about the steak, dear. I
merely said I didn't see that old horse
that used to be tethered outside here."
Never Give a Sucker an Even Break
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