Adding large numbers and calculate modulo

[zionet]

Exmaple:
112121276783621784678236478236478623784672364782367846237846782364782367846238 + 783627846782364786237846782364782367846237846782364782367846237846237864782367846238

It should be efficient and fast. It is useful to calculate the Factorial 100000, and then I calculate the number of the module.

Example:
132142344564378657834657834657863785634786578346578346785634785678653478 % 124623874

what is the code?

No puedo usar la libreria BIGINTEGER. It should be efficient and fast
HELP

[Chriscpp]

what is the code?

Where is your code?

[Mats]

If you want speed, then use gmp. http://gmplib.org/