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max int value?

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max int value?

Feb 20th, 2005

hey anyone know what the largest value that can be stored in an integer variable is? likewise is there a double / long type of deal that isnt of float type? thanks

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Re: max int value?

Feb 20th, 2005

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hey anyone know what the largest value that can be stored in an integer variable is?

That is up to your implementation, but you can assume that the size of an int is the natural word size of your system. A 32 bit system will most likely have 32 bit integers, so the largest value is 4,294,967,296. You can only assume the range of -32,767 to 32,767 for int if you want your code to be portable though. If you want at least a 32 bit data type then long int is the way to go.

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likewise is there a double / long type of deal that isnt of float type?

I don't understand what you are asking.

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Re: max int value?

Feb 20th, 2005

There is a file called LIMITS.H that has all the values you are looking for.

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Re: max int value?

Feb 20th, 2005

well if you have a float value that is too large for a normal float you can us a double to give it twice the normal memory usage...

i was wondering if there was an int type of variable to do the same.

i am basically working with addition of two hexadecimal numbers each of which can be up to 20 characters long, when i add two of these i am storing it in an int variable, and i am thinking the reason i am having problems with the output is becuase the answer it returns is too large to be stored in the int...

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Re: max int value?

Feb 20th, 2005

A 20 character long hexadecimal value would exceed any of C++'s types. Try an arbitrary precision library such as GMP.

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Re: max int value?

Feb 20th, 2005

well the project is for a intro level c++ class , so it seems like the prof wouldnt require us to do soemthin that required libraries other than the ones in code warrior to start with. im thinkin im gonna have to store the value as a character array and only convert it to actual numbers when i need to manipulate them, that way i dont have to deal w/ the whole thing as one huge number, jus go one slot at a time thru the array. thanks alot for speedy replies by the way

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Re: max int value?

Feb 20th, 2005

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Originally Posted by jamboadams

hey anyone know what the largest value that can be stored in an integer variable is? likewise is there a double / long type of deal that isnt of float type? thanks

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream>
#include <limits>
 
int main(void)
{
   std::cout << std::numeric_limits<int>::max()    << std::endl;
   std::cout << std::numeric_limits<double>::max() << std::endl;
   return 0 ;
}
 
/* my output
2147483647
1.79769e+308
*/
#include <iostream>
#include <limits>

int main(void)
{
   std::cout << std::numeric_limits<int>::max()    << std::endl;
   std::cout << std::numeric_limits<double>::max() << std::endl;
   return 0 ;
}

/* my output
2147483647
1.79769e+308
*/

"One of the methods used by statists to destroy capitalism consists in establishing controls that tie a given industry hand and foot, making it unable to solve its problems, then declaring that freedom has failed and stronger controls are necessary." --Ayn Rand

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Re: max int value?

Feb 21st, 2005

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Originally Posted by jamboadams

im thinkin im gonna have to store the value as a character array and only convert it to actual numbers when i need to manipulate them

Exactly. I've never found the need to do something like this with binary numbers, but before co-processors I coded this kind of thing on the Z80 to give me 128 digit precision in BCD (Binary Coded Decimals).

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Re: max int value?

Feb 25th, 2009

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Originally Posted by Siersan

the largest value is 4,294,967,296.

The largest int ist 2^31 = 2147483647.
One bit is used to store the sign.

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Re: max int value?

#10

Feb 25th, 2009

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Originally Posted by jamboadams

well the project is for a intro level c++ class , so it seems like the prof wouldnt require us to do soemthin that required libraries other than the ones in code warrior to start with. im thinkin im gonna have to store the value as a character array and only convert it to actual numbers when i need to manipulate them, that way i dont have to deal w/ the whole thing as one huge number, jus go one slot at a time thru the array. thanks alot for speedy replies by the way

Yep, that's why we make assignments like that.

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