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Jun 8th, 2009
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can long long stor 12 dig num?ifno, without array how 2 do?

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can long long store 12 digit numbers.
Its showing in my comp that limit of long long is 9223372036854775807, but then it's showing too large when i declare it like this:
long long num;
i don't want to store in array.
My seniors told that long long will do but i am having trouble.
please help.
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Re: can long long stor 12 dig num?ifno, without array how 2 do?

a) post what you actually tried, not a description.
b) post your actual error messages
c) tell us what your OS/Compiler is.
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Re: can long long stor 12 dig num?ifno, without array how 2 do?

From this thread I would suggest you to use: unsigned long long

>can long long store 12 digit numbers.
Depends on what your compiler is...
Last edited by tux4life; Jun 8th, 2009 at 4:31 pm.
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Re: can long long stor 12 dig num?ifno, without array how 2 do?

this is my code. Problem as described above.
We have to find largest prime factor of a number.
C++ Syntax (Toggle Plain Text)
  1. #include<iostream>
  2. using namespace std;
  3. int main()
  4. {
  5.  
  6. 	long long num=600851475143,large,k,i;
  7.  
  8. 	for(i=2;;++i)
  9. 	{  k=i;
  10. 		if(num%i==0)
  11. 		{	num/=i;
  12. 			i=k-1;
  13. 			large=k;
  14. 		}
  15. 	   if(num==1)
  16. 		   break;
  17. 	}
  18. cout<<large;
  19. return 0;
  20. }
the error i get is:
integer constant is too large for ‘long’ type
i don't want to use array.
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Re: can long long stor 12 dig num?ifno, without array how 2 do?

unsigned long long gives same error.
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Re: can long long stor 12 dig num?ifno, without array how 2 do?

>i don't want to use array.
In that case there's probably no other choice left than choosing for a Big Number library like GNU MP, it can handle much bigger numbers than a standard C++ datatype can...

And take a look at Salem's post as well:
  • What is your compiler?
  • What is your OS?
Last edited by tux4life; Jun 8th, 2009 at 4:36 pm.
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Re: can long long stor 12 dig num?ifno, without array how 2 do?

Try to append LL suffix to long long constants.
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Re: can long long stor 12 dig num?ifno, without array how 2 do?

Try
long long num=600851475143LL,large,k,i;
to tell the compiler that the constant is a long long.
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Re: can long long stor 12 dig num?ifno, without array how 2 do?

ubuntu 8.10
compiler g++ 4:4.3.1
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Re: can long long stor 12 dig num?ifno, without array how 2 do?

thanks man, a million thanks. It works
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