CSE 232 Spring 2012                    Name: __________________________________

Lab Exercise #3 -- C++ Control Structures

A. Selective and Repetitive Control Constructs

a) Examine the C++ program below, and answer the questions about that program
in the blanks provided.

===============================================================================

using namespace std;
#include <iostream>

int main()
{
  int A = 0, B = 0, C = 0, D = 0;

  // Give the value displayed by each of the output operations below.

  while (A <= 8)
  {
    A += 2;
    switch (A%3)
    {
      case 0:  ++B;
      case 1:  ++C;
    }
    ++D;
  }
  cout << endl;

  cout << "Value of A: " << A << endl;              // Value of A: ____________

  cout << "Value of B: " << B << endl;              // Value of B: ____________

  cout << "Value of C: " << C << endl;              // Value of C: ____________

  cout << "Value of D: " << D << endl << endl;      // Value of D: ____________

  A = B = C = 0;

  cout << "Enter the input sequence:  10  15  20  -1  25  -2" << endl;

  do
  {
    cin >> A;
    ++B;
    C += A;
  }
  while (A > 0);

  cout << endl;

  cout << "Value of A: " << A << endl;              // Value of A: ____________

  cout << "Value of B: " << B << endl;              // Value of B: ____________

  cout << "Value of C: " << C << endl << endl;      // Value of C: ____________



  A = B = C = 0;

  for (A=2; A<15; ++A)
  {
    ++B;
    if (A > 10)
    {
      ++C;
    }
  }
  cout << "Value of A: " << A << endl;              // Value of A: ____________

  cout << "Value of B: " << B << endl;              // Value of B: ____________

  cout << "Value of C: " << C << endl << endl;      // Value of C: ____________

  A = B = C = 0;

  for (A=13; A>3; A-=3 )
  {
    if (A/2*2 == A)
    {
      ++B;
    }
    ++C;
  }
  cout << "Value of A: " << A << endl;              // Value of A: ____________

  cout << "Value of B: " << B << endl;              // Value of B: ____________

  cout << "Value of C: " << C << endl << endl;      // Value of C: ____________
}

===============================================================================

b) After completing (a) above, compile and execute the C++ program to check
your answers.  The source code for the program is available on the CSE system
as "/user/cse232/Labs/lab03.partA.cpp".

If any of your answers are incorrect, re-work the appropriate questions.


B. The file "/user/cse232/Labs/lab03.partB.design" contains the design document
for a program which will assist a teacher to compute statistics about a set of
exam scores.

The file "/user/cse232/Labs/lab03.partB.cpp" contains the outline of a C++
program which implements that design, which you are to complete and
demonstrate to the your TA.

Copy the skeleton program into your account and use the design document, as
well as the comments in the source code, to guide your modifications and
enhancements.

Test the completed program using a variety of input values, then demonstrate
the results to your TA.