Lib-GMP calculator!

Lib-GMP (The GNU Multiple Precision Arithmetic Library) is among the most powerful C/C++ tools available. It allows someone to manipulate variables on a computer limited only by the amount of physical memory located on the machine. For more information on Lib-GMP, check out:
http://gmplib.org/

The following is an example of Lib-GMP manipulation power of integers.
Enter an integer expression in the field below. The expression may include +, -, *, /, %, ^ (exponentiation), and ! (factorial), the n-ary functions `gcd', `lcm', `and', `ior', `xor', `mul', `plus', the binary functions `minus', `div', `mod', `rem', and the unary function `popc' (population count). Most functions may also be used in infix form. All constants must be integers. An example of a valid expression is:
1 + gcd(87324,78263148,7896) * (10^1989879887 mod 471!) + (23456789 mod ((32003-1)/2))

These computations are running on a machine with the following specs:
Four 2.4GHz Intel Pentium Xeon Processors, 3GB RAM, 19197 Bogomips Total
running:
Linux Version 2.6.39.4-smp, Compiled #1 SMP Mon Mar 14 22:02:40 MDT 2016

If you want to know how to do things such as this with GMP, take a look at demos/pexpr.c in the GMP distribution, the program used to compute these expressions.