This is my big integer class implementation for C++. You can use it to perform following operations on numbers of any size:

1. Arithmetical operators: +, -, *, /, %;
2. Boolean operators: >, <, ==, <=, >=;
3. Unary operators: -, +;
4. Assignment operators: = (to big_int=big_int, big_int=string and big_int=int);
5. Input/output operators: >>, <<;
6. Increment and decrement operators: both prefix and postfix ++, both prefix and postfix --;
7. Arithmetic operators with assignment: +=, -=, *=, /=, %=;
8. Other math functions:

• abs(big_int): returns absolute value of a number
• fact(big_int): returns factorial of a number
• pow(big_int, big_int): raises number to given non-negative power
• sqrt(big_int): calculates square root of a number
• root(big_int, big_int): Calculates root of a given degree from a number