big numbers

[Good Programmer]

hi....
i have a problem
we know that when we wanna to use big numbers we can t use (int,long int,...)
how we can solve this problem.....
for example when we want to get the value of 50! what should we do?!
my compiler is Dev C++....

[Athar]

If it doesn't have be accurate, you can use double.
For everything else, there's GMP:
http://gmplib.org/

[RyanCaywood]

int can go up to somewhere close to 1,000,000,000 I believe. Do you really need a number larger than that?

[Athar]

Since 50! equals 30414093201713378043612608166064768844377641568960512000000000000, he probably does.

[mcleano]

int can go up to somewhere close to 1,000,000,000 I believe.

No. An unsigned int can go up to 4,294,967,295. 2^32 = 4,294,967,296 (and then - 1 to account for the value 0 to get ...295)

[jsmith]

Or 18,446,744,073,709,551,615 if running 64-bit.

[Good Programmer]

for numbers that they have about 200 or grether digits what we should do!?

[jsmith]

Athar wrote:

For everything else, there's GMP:
http://gmplib.org/

[mcleano]

@jsmith... I thought I remember seeing a boost library for handling large numbers, am I thinking of something else?

[Duthomhas]

There are a few people who have wanted to begin or have begun such a project, but as yet the attempts are not mature, nor are they currently a part of Boost's libraries. You can google around for implementations...

There is little interest for Boost committee members because you already get nice C and C++ bignum from GMP, which is a very mature and heavily optimized package.

[magnificence7]

Or, if you are the hobbyist kind of programmer, you might want to create such a class yourself ;)

[Rockysaini]

Well mate, try to use gmp library functions. Its public available on the links given above. Its really fun to play with those big nos using gmp.

Regards,

Rocky