in c++ language

Given big_num.h and big_num_driver.cpp implement, the big_num class so that the main in big_num_driver.cpp will work. Do not change the main it is good. see examples vocstartsoft:-/environment/Lab6 $ ./BigNum Enter a number: 98347901287 Enter a number: 38120383 98347901287 + 38120383 = 98386021670 vocstartsoft:~/environment/Lab6 $ ./BigNum Enter a number: 99999 Enter a number: 1 99999 + 1 = 100000 vocstartsoft:~/environment/Lab6 $ ./BigNum Enter a number: 321 Enter a number: 82344234789 321 + 82344234789 = 82344235110 vocstartsoft:-/environment/Labs $ | When you are finished submit you big num.h file #ifndef BIGNUM H #define BIGNUM H #include #include #include #include class big_num { public: big_num(std::string); friend std::ostream& operator digits; // an array of numDigits digits }; #endif #include #include #include #include "big, num.h" int main() { std::string str; std::cout