a.  Write C++ statements that include the header files iostream and string.
b.  Write a C++ statement that allows you to use cin, cout, and endl 
    without the prefix std::.
c.  Write C++ statements that declare the following variables: name of 
    type string and studyHours of type double.
d.  Write C++ statements that prompt and input a string into name 
    and a double value into studyHours.
e.  Write a C++ statement that outputs the values of name and studyHours 
    with the appropriate text. For example, if the value of name is "Donald" 
    and the value of studyHours is 4.5, the output is:
    Hello, Sam! on Saturday, you need to study 4.5 hours for the exam.
f.  Compile and run your program.

Code:

#include <iostream>
#include <string>

using namespace std;

int main()
{
  string name;
  double studyHours;
  
  cout << "Please enter your name: ";
  cin >> name;
  cout << "Please enter the number of study hours: ";
  cin >> studyHours;

  cout << "Hello " << name << "! on Saturday, you need to study " << studyHours;
  cout << " hours for the exam. " << endl;
  
  return 0;
}