A number expressed in scientific notation is represented by its mantissa (a fraction) and its exponent. Write a function that reads a character string that represents a number in C++ scientific notation and stores the number in a struct with two members. Write a function that prints the contents of this struct as a real value. Also write functions that compute the sum, product, difference, and quotient of two numbers in scientific notation stored in two struct arguments. (Hint: The string -0.1234E20 represents a number in scientific notation. The fraction -0.1234 is the mantissa and the number 20 is the exponent).