Sesson 5: L E S S O N S E T 5 Loops and Files 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 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 { // 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; } Lesson 5A 67 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;
Sesson 5: L E S S O N S E T
5 Loops and Files
Bring in
// 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 <iostream>
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
{
// 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;
}
Lesson 5A 67
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;
Step by step
Solved in 5 steps with 4 images
