1. Structured Data Types
array
union
struct
class

2. Data Types simple or atomic structured char, int, float, double
array, union, struct, class
* *

3. Structured Data Types
array - homogeneous
struct - heterogenous

4. Abstract Data Type
ADT = a programmer defined data type whose properties (domain [values] and operations) are specified independently of any particular implementation.
It has a what and a how. *

5. Data Storage
character
field
record
table
database

6. Structured Data Types
struct = an abstract data type with a fixed number of components that are accessed by name, not by index.

7. Structure Declaration
struct Date // customarily initial caps {
int month; //
int day; // data_type member_name
int year; // };

8. Structure Declaration
struct TypeName {
MemberList // DataType MemberName }; }

9. structure declaration
vs.
object declaration
(object  variable)

10. Structure Declaration
struct Date {
int month;
int day;
int year; };

11. Object Instantiation int num; double x; Date myBirth;
variable name
data type
Date myBirth;
Date today, bill_Date, lily_Bday; *

12. Assigning Values Date myBirth = {2, 29, 1963};
Date today = {11, 25, 1999};
Date bill_Date = {3, 25, 2001};
Date lily_Bday = {1, 20, 1995};

13. Assigning Values myBirth = {2, 29, 1963}; today = {11, 25, 1999};
bill_Date = {3, 25, 2001};
lily_Bday = {1, 20, 1995};

14. member of myBirth instance
Assigning Values
member of myBirth instance
instance of Date
myBirth.month = 2;
myBirth.day = 29;
myBirth.year = 1963;
bill_Date.month = 3;
bill_Date.day = 25;
lily_Bday.year = 1995;
today.month = 4;
* *

15. In Class Assignment 1 element at_num at_mass density boron (B) 5
10.811
2.34
tungsten (W) 74
183.85
19.30
iodine (I) 53
126.9
4.94
1. declare a structure for this table.
2. instantiate variables of the structure type
3. initialize the data for each element (use two different methods)

16. Assigning Values // assign to a variable year = lily_Bday.year
new_mo = lily_Bday.month + 1
// assign contents of a variable to it
lily_Bday.month = someMonth;

17. Assigning Values Date today, bill_date;
cout << “Enter month, day and year: “;
cin >> today.month >>today.day >> today.year;
bill_date = today; // an aggregate action *

18. Structures as Arguments
// in a prototype
int Overdue(Date, int);
// in a function call
Overdue(today, bill_Date.year);
// in a function header
int Overdue(Date now, int purchased)
* * * *

19. In Class Assignment 2 Element at. num. at. mass density
hydrogen (H)
fluorine (F)
4. Write the code for user input for H and F.
5. Write the code to display data .
6. Put each of these codes into separate functions.
(Call the object atom.)

20. In Class Assignment 2 7. Create a program that uses these functions.
a) What needs to be done?
7. Create a program that uses these functions.
a) What needs to be done?
a) What needs to be done?
a) What needs to be done?
declare (define) the structure
declare the prototypes
in main(): declare the objects
call the functions
8. As a formatting exercise, display the data neatly in a table.
* * *
* *

21. In Class Assign. 2-ans #7 b // display data - formatted
void showData(Element any_at) {
cout << setiosflags(ios::fixed);
cout << '\n' << setw(12) << any_at.symbol
<< setprecision(0) << setw(5) << any_at.at_num
<< setprecision(3) << setw(10) << any_at.at_mass
<< setprecision(3) << setw(10) << any_at.density;
cout << endl; }

22. In Class Assign. 2-ans #include<iostream.h>
#include<iomanip.h>
struct Element {
char symbol;
int at_num;
double at_mass;
double density; };
void getData(Element&);
void showData(Element);
void main() {
Element hydrogen, fluorine;
getData(hydrogen);
getData(fluorine);
showData(hydrogen);
showData(fluorine);
cout << endl<<endl;
} // end main()