CSE 232 Spring 2012                  Name: __________________________________

Lab Exercise #6 -- Data Aggregates (Records and Arrays)

A. Examine the C++ program below, and give the value displayed by the program
for each output operation.

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

struct Record
{   
  unsigned A;
  char B[20];
  float C;
};  

Record Temp, List[100];

int main()
{   
  // The operator "sizeof" evaluates to the number of bytes for its operand,
  // which can be a data type or a data object.

  cout << endl;
 
  cout << "float: " << sizeof(float) << endl;                    // ____________

  cout << "double: " << sizeof(double) << endl;                  // ____________

  cout << "char: " << sizeof(char) << endl;                      // ____________

  cout << "short int: " << sizeof(short int) << endl;            // ____________

  cout << "int: " << sizeof(int) << endl;                        // ____________

  cout << "unsigned char: " << sizeof(unsigned char) << endl;    // ____________

  cout << "unsigned short: " << sizeof(unsigned short) << endl;  // ____________

  cout << "unsigned int: " << sizeof(unsigned int) << endl;      // ____________

  cout << "unsigned: " << sizeof(unsigned) << endl;              // ____________

  cout << endl;

  cout << "Temp: " << sizeof(Temp) << endl;                      // ____________

  cout << "Temp.A: " << sizeof(Temp.A) << endl;                  // ____________

  cout << "Temp.B: " << sizeof(Temp.B) << endl;                  // ____________

  cout << "Temp.C: " << sizeof(Temp.C) << endl;                  // ____________

  cout << "List: " << sizeof(List) << endl;                      // ____________

  cout << "List[0]: " << sizeof(List[0]) << endl;                // ____________

  cout << "N: " << sizeof(List) / sizeof(List[0]) << endl;       // ____________

  cout << endl;



  // Cast all addresses so that they are displayed as decimal values
  // (instead of hexadecimal values) using a "typedef".

  // Assume that "List" begins at address 6296832 (base 10)

  cout << "&List[0]: " << (base10) &List[0] << endl;             // ___6296832__

  cout << "&List[0].A: " << (base10) &List[0].A << endl;         // ____________

  cout << "&List[0].B: " << (base10) &List[0].B << endl;         // ____________

  cout << "&List[0].C: " << (base10) &List[0].C << endl;         // ____________

  cout << "&List[0].B[0]: " << (base10) &List[0].B[0] << endl;   // ____________

  cout << "&List[0].B[4]: " << (base10) &List[0].B[4] << endl;   // ____________

  cout << endl;

  cout << "&List[5]: " << (base10) &List[5] << endl;             // ____________

  cout << "&List[5].A: " << (base10) &List[5].A << endl;         // ____________

  cout << "&List[5].B: " << (base10) &List[5].B << endl;         // ____________

  cout << "&List[5].C: " << (base10) &List[5].C << endl;         // ____________

  cout << "&List[5].B[0]: " << (base10) &List[5].B[0] << endl;   // ____________

  cout << "&List[5].B[4]: " << (base10) &List[5].B[4] << endl;   // ____________

  cout << endl;
}

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

B. After completing part A, compile and execute the C++ program to check your
answers.  From your home directory, use the following commands:

  <prompt> g++ -Wall ~cse232/Labs/lab06.program.cpp
  <prompt> a.out

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


C. The file "~cse232/Labs/lab06.skeleton.cpp" contains the outline of a C++
program, which you are to complete and demonstrate to your TA.  Copy the
skeleton program into your account and use the comments to guide your
modifications and enhancements.

Test the completed program using a variety of input values.  The file
"~cse232/Labs/lab06.data" contains a sample data set which you may use for
some of your testing.  Other test cases that you should consider:  a data file
which contains too few students or one which contains too many students.

Demonstrate the completed program to your TA.