Homework
Implement a class, bignum, that can perform certain
mathematical operations on integers of arbitrary
length. Your class should have (at least) three constructors: one to initialize bignum from a char *, and one to initialize from an int. A constructor taking no args should initialize the number to 0. You should have a print() function to print the number on standard output. You should support (at least) the + (addition) and - (subtraction) operations using operator overloading.