blob: a0c10658bb991c5cd0dfca00f1988979b7e9b0d4 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
// Fig. 2.9: fig02_09.cpp
// Class average program with sentinel-controlled repetition.
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
using std::fixed;
#include <iomanip> // parameterized stream manipulators
using std::setprecision; // sets numeric output precision
// function main begins program execution
int main()
{
int total; // sum of grades
int gradeCounter; // number of grades entered
int grade; // grade value
double average; // number with decimal point for average
// initialization phase
total = 0; // initialize total
gradeCounter = 0; // initialize loop counter
// processing phase
// get first grade from user
cout << "Enter grade, -1 to end: "; // prompt for input
cin >> grade; // read grade from user
// loop until sentinel value read from user
while ( grade != -1 ) {
total = total + grade; // add grade to total
gradeCounter = gradeCounter + 1; // increment counter
cout << "Enter grade, -1 to end: "; // prompt for input
cin >> grade; // read next grade
} // end while
// termination phase
// if user entered at least one grade ...
if ( gradeCounter != 0 ) {
// calculate average of all grades entered
average = static_cast< double >( total ) / gradeCounter;
// display average with two digits of precision
cout << "Class average is " << setprecision( 2 )
<< fixed << average << endl;
} // end if part of if/else
else // if no grades were entered, output appropriate message
cout << "No grades were entered" << endl;
return 0; // indicate program ended successfully
} // end function main
/**************************************************************************
* (C) Copyright 1992-2003 by Deitel & Associates, Inc. and Prentice *
* Hall. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
*************************************************************************/
|
