How to convert tree Int to one Int?

hello,
i converted 3 int:

int = 12;
int b = 10;
int b = 11;

how 3 joined int?
int abc = 101211;

i need please!
thanks!

first of int won't hold number big.

code: [select]


int = 12;
int b = 10;
int c = 11;

long = (a * 10,000l) + (b * 100) + c;




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