I could already solve my problem with saving large numbers (download a library to be able to save large numbers and that can also store many decimals, goodbye floats and longs). But I have another problem, and that is that I need to concatenate two "integers" (I don't know how the library can store such large numbers in a variable), the case is that that variable behaves like an int, and I need to be able to concatenate those two variables, for example:

```
#include "BigNumber.h"
BigNumber A = "10";
BigNumber B = "1";
BigNumber C;
C = A + B; //I need something to concat this things
Serial.print(C); //Expected: "101";
```

And the problem is that I already try to convert them to "Strings" and then concatenate them, that works, but the problem comes when I have to convert them back to "BigNumber", I cannot use "C.toInt ()" because I am handling numbers very big and those numbers are lost.

I need help, thanks!