Bring in program sentinel.cpp from the Lab 5 Folder. The code is shown below:

// 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.

// PLACE YOUR NAME HERE

#include usingnamespacestd;

int main()

{

// Fill in the code to define and initialize to 1 the variable month

float total = 0, rain;

cout << "Enter the total rainfall for month " << month<< endl; cout << "Enter -1 when you are finished" <

// Fill in the code to read in the value for rain

// Fill in the code to start a while loop that iterates

// while rain does not equal -1

{

// Fill in the code to update total by adding it to rain

// Fill in the code to increment month by one

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

}

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;

}

Exercise 4: Complete the program above by filling in the codedescribed in the statements in bold so that it will perform theindicated task.

Exercise 5: Run the program several times with various input.Record your results. Are they correct? What happens if youenter 1 first? What happens if you enter only values of 0 forone or more months? Is there any numeri- cal data that youshould not enter?

Exercise 6: What is the purpose of the following code in the program above?

if (month == 1)

cout << "No data has been entered" << endl;