numbers bigger than uint32 / uint64

[k bah]

 Hi,

 I use octave, but all I write has to work on matlab too. On octave I can do 
some operations with uint64 that I cannot do on matlab. Because of that I use 
uint32. I only want to do these operations: a) convert to string b) convert 
from string c) sum d) reverse the number ( 143 -> 341) while it's on a form of 
a string

 When my numbers (all positive integers) overflow uint32 capacity, my for() 
loop stops, and a message is shown. I could:

 1) use the binary representation of the number, then the limit would be (in 
theory) the available memory (since I would be using a matrix), the problem 
here is:

 ...1a) How can get the binary representation of the inverted number? reverse 
the binary matrix will not give me that
 ...1b) What's the algorithm to sum binary numbers, knowing they are stored on 
a vector, as I get from dec2bin().

 2) use the decimal representation of the number, but store it on a matrix, 
each digit on a position in the matrix
 ...2a) How to get digit by digit from my decimal? If the number is stored on a 
string, then it's ok, but how to do it when it's on a integer variable?
 ...2b) the algorithm to add the decimal numbers, given the fact they're stored 
on the above matrix and they exceed the uint32 capacity (so I cannot get the 
entire matrix back to an integer, just work with each digit on each position).


 thanks

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