• aerto (2/2) Mar 21 2018 why pow(256, 27) gives 0, instead of
• Adam D. Ruppe (9/11) Mar 21 2018 that result is simply too big to fit in the result. Try using a
• aerto (3/14) Mar 21 2018 thanks, a last question in a diffrent function i use
• Adam D. Ruppe (7/8) Mar 21 2018 use
• H. S. Teoh (10/12) Mar 21 2018 Because 256, being an int type, can only hold a 32-bit result, the

aerto <cvsc gmx.com> writes:

why pow(256, 27) gives 0, instead of 
105312291668557186697918027683670432318895095400549111254310977536L

Adam D. Ruppe <destructionator gmail.com> writes:

On Wednesday, 21 March 2018 at 15:56:00 UTC, aerto wrote:
 why pow(256, 27) gives 0, instead of 
 105312291668557186697918027683670432318895095400549111254310977536L

that result is simply too big to fit in the result. Try using a 
bigint instead:

import std.bigint, std.stdio;

void main() {
	BigInt i = 256;
	i ^^= 27;
	writeln(i);
}

aerto <cvsc gmx.com> writes:

On Wednesday, 21 March 2018 at 16:00:56 UTC, Adam D. Ruppe wrote:
 On Wednesday, 21 March 2018 at 15:56:00 UTC, aerto wrote:
 why pow(256, 27) gives 0, instead of 
 105312291668557186697918027683670432318895095400549111254310977536L

 that result is simply too big to fit in the result. Try using a 
 bigint instead:

 import std.bigint, std.stdio;

 void main() {
 	BigInt i = 256;
 	i ^^= 27;
 	writeln(i);
 }

thanks, a last question in a diffrent function i use 
writeln(105312291668557186697918027683670432318895095400549111254310977536L);
and i get Error: integer overflow any solution >?

Adam D. Ruppe <destructionator gmail.com> writes:

On Wednesday, 21 March 2018 at 16:29:26 UTC, aerto wrote:
 thanks, a last question in a diffrent function i use

use

BigInt i = 
"105312291668557186697918027683670432318895095400549111254310977536";

and it should work. Note the quotation marks - it reads it as a 
string because a long number literal is limited o 64 bit 
representations.

"H. S. Teoh" <hsteoh quickfur.ath.cx> writes:

On Wed, Mar 21, 2018 at 03:56:00PM +0000, aerto via Digitalmars-d wrote:
 why pow(256, 27) gives 0, instead of
 105312291668557186697918027683670432318895095400549111254310977536L

Because 256, being an int type, can only hold a 32-bit result, the
maximum of which is 2^31 (or 2^32 if you use uint). But 256^27 = 2^216,
far bigger than a 32-bit int can hold.

As Adam said, you probably want to use BigInt instead:

	import std.bigint;
	auto result = pow(BigInt(256), 27);


T

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