Can somebody help me with these exercises?

// 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.

#include using namespace std;

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" << endl; // 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

{

}

if (month == 1) cout << "No data has been entered" << endl;

else cout << "The total rainfall for the " << month-1

return 0; }

// 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

<< " months is "<< total << " inches." << endl;

Lesson 5A

Exercise 4: Complete the program above by filling in the code described in the statements in bold so that it will perform the indicated task.

Exercise 5: Run the program several times with various input. Record your results. Are they correct? What happens if you enter 1 first? What happens if you enter only values of 0 for one or more months? Is there any numeri- cal data that you should 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;