Generally, you cannot. The contents of limits.h generally reflects technical limits on capability of your compiler on your target operating system. Most compilers will need to be rewritten/extended/modified to support a change of those values.

okay, is there anything i can do?

You can implement a class type that has the attributes you want (or find such a class type that someone else has implemented). Internally, that type might use an array of integers or (as Freaky_Chris suggested) a string to represent larger values. You would need to define mathematical operations and also things like streaming (so you can read or write the data to a file stream).

well file i/o sounds fine, but about defining mathematical operations and.. still the string and class thing? i dont get it :-( i havent worked with structures and classes for a looong while, so i will re-read some documentation on the subject:-) what do you mean with defining mathematical operations?

would splitting up the large numbers and assigning them to an array of ints help anything??

Mathematical operations: operators like * (multiplication), + (addition), - (subtraction or negation), / (division), etc.

Splitting up large number and assigning them to an array of ints is one way: such things can be implemented using a class.

By defining mathematical operations he means you need to deal with things such as addition, multiplication etc.
You would do this by overloading the different operators such as operator+().
Also the you will want to overload the stream operators as grumpier suggested that would be the << and >> so that the data can be outputted into files and the standard output. Aswell as read into your data type.

Chris

I really dont mean to waste anyone's time, so i hope you will bare with me once again.

@Chris, you want me to save the data in files instead of in variables? and then make the calculation by changing the file instead of a variable?

@grumpier, thanks, at least that makes sence to me now ;-)

EDIT: If i use a file instead of a variable i would still have to asign the value to variable when i want to use it, right?