text: // This program illustrates the use of a sentinel in a while loop.
  // The user is asked for monthly rainfall totals until a sentinel
  // value of -1 is entered. Then the total rainfall is displayed
  
  // JESUS HILARIO HERNANDEZ
  
  #include <iostream>
  using namespace std;
  
  int main()
  {
      // Fill in the code to define and initialize to 1 the variable month
      float total = 0, rain;
      int month = 1;
  
      cout << "Enter the total rainfall for month " << month << endl;
      cout << "Enter -1 when you are finished" << endl;
      // Fill in the code to read in the value for rain
      cin >> rain;
  
      // Fill in the code to start a while loop that iterates
      // while rain does not equal -1
      while(rain != -1)
      {
          // Fill in the code to update total by adding it to rain
          total += rain;
          // Fill in the code to increment month by one
          month++;
  
          cout << "Enter the total rainfall in inches for month "
          << month << endl;
          cout << "Enter -1 when you are finished" << endl;
          // Fill in the code to read in the value for rain
          cin >> rain;
      }
  
      if (month == 1)
          cout << "No data has been entered" << endl;
  
      else
          cout << "The total rainfall for the " << month-1
          << " months is "<< total << " inches." << endl;
  
  
      return 0;
  }
  