The calculator should be able to do calculations on integers, using the operators +, -, *, /. With an ='s sign used to return the answer. It should return an error message if an expression is malformed, i.e. doesn't have enough operands or operators.

Simple Long Integer Math for C++

High-efficiency C++ divisibility-test prime factorizer

Library supporting streams of arbitrary sub-register sized signed and unsigned integers in contiguous stream

Header-only library for packed integers manipulations

Simple C++ procedure to convert any String or Command to an enumerated int value

C++ project to generate random Integers for n times (user defined). [random()]

Yet another naive approach to build a C++ library for addition and multiplication of unlimiteded integers.

Variable length integer operations

A platform-independent C++ library, for Boost, for the definition and transparent manipulation of integers of arbitrary size.

Simple operations with Big Integers as strings