1. User Defined Types – The Struct

2. struct Intro to Object-Oriented Programming (OOP)
Allows us to abstract at a higher level to build entities more complex than short, long, int, float, double, char, and bool
With it programmers can create their own types to define what should make up a student, a class, a department, a university, etc.

3. struct syntax
// placed in a header file struct type_name { member_type1 member_name1; member_type2 member_name2; . . member_typeN member_nameN; };

4. syntax
example
// placed in a header file struct type_name { member_type1 member_name1; member_type2 member_name2; . . member_typeN member_nameN; };
// point.h
struct point {
    float m_Xcoord;
    float m_Ycoord; };

5. syntax
example
// placed in a header file struct type_name { member_type1 member_name1; member_type2 member_name2; . . member_typeN member_nameN; };
// point.h
struct point {
    float m_Xcoord;
    float m_Ycoord; };

6. syntax
example
// placed in a header file struct type_name { member_type1 member_name1; member_type2 member_name2; . . member_typeN member_nameN; };
// point.h
struct point {
    float m_Xcoord;
    float m_Ycoord; };

7. syntax
example
// placed in a header file struct type_name { member_type1 member_name1; member_type2 member_name2; . . member_typeN member_nameN; };
// point.h
struct point {
    float m_Xcoord;
    float m_Ycoord; };

8. syntax
example
// placed in a header file struct type_name { member_type1 member_name1; member_type2 member_name2; . . member_typeN member_nameN; };
// point.h
struct point {
    float m_Xcoord;
    float m_Ycoord; };

9. syntax
example
// placed in a header file struct type_name { member_type1 member_name1; member_type2 member_name2; . . member_typeN member_nameN; };
// point.h
struct point {
    float m_Xcoord;
    float m_Ycoord; };

10. syntax
example
// placed in a header file struct type_name { member_type1 member_name1; member_type2 member_name2; . . member_typeN member_nameN; };
// point.h
struct point {
    float m_Xcoord;
    float m_Ycoord; };

11. struct in use
int main() { point p1, p2; // 2 points with 2 floats in each p1.m_Xcoord = 4; p1.m_Ycoord = 6; cout << "enter p2’s x: "; cin >> p2.m_Xcoord; cout << "and the y: "; cin >> p2.m_Ycoord; cout << "the x coordinate of p1 is “ << p1.m_Xcoord; ...

12. struct in use
int main() { point p1, p2; // 2 points with 2 floats in each p1.m_Xcoord = 4; p1.m_Ycoord = 6; cout << "enter p2’s x: "; cin >> p2.m_Xcoord; cout << "and the y: "; cin >> p2.m_Ycoord; cout << "the x coordinate of p1 is “ << p1.m_Xcoord; ...

13. struct in use
int main() { point p1, p2; // 2 points with 2 floats in each p1.m_Xcoord = 4; p1.m_Ycoord = 6; cout << "enter p2’s x: "; cin >> p2.m_Xcoord; cout << "and the y: "; cin >> p2.m_Ycoord; cout << "the x coordinate of p1 is “ << p1.m_Xcoord; ...

14. struct in use
int main() { point p1, p2; // 2 points with 2 floats in each p1.m_Xcoord = 4; p1.m_Ycoord = 6; cout << "enter p2’s x: "; cin >> p2.m_Xcoord; cout << "and the y: "; cin >> p2.m_Ycoord; cout << "the x coordinate of p1 is “ << p1.m_Xcoord; ...

15. struct in use
int main() { point p1, p2; // 2 points with 2 floats in each p1.m_Xcoord = 4; p1.m_Ycoord = 6; cout << "enter p2’s x: "; cin >> p2.m_Xcoord; cout << "and the y: "; cin >> p2.m_Ycoord; cout << "the x coordinate of p1 is “ << p1.m_Xcoord; ...

16. struct in use
int main() { point p1, p2; // 2 points with 2 floats in each p1.m_Xcoord = 4; p1.m_Ycoord = 6; cout << "enter p2’s x: "; cin >> p2.m_Xcoord; cout << "and the y: "; cin >> p2.m_Ycoord; cout << "the x coordinate of p1 is “ << p1.m_Xcoord; ...

17. structs within structs
struct point { float m_Xcoord; float m_Ycoord; }; struct line point m_Left; point m_Right; int main() line my_line; my_line.m_Left.m_Xcoord = 5; my_line.m_Left.m_Ycoord = 8; ...

18. structs within structs
struct point { float m_Xcoord; float m_Ycoord; }; struct line point m_Left; point m_Right; int main() line my_line; my_line.m_Left.m_Xcoord = 5; my_line.m_Left.m_Ycoord = 8; ...

19. structs within structs
struct point { float m_Xcoord; float m_Ycoord; }; struct line point m_Left; point m_Right; int main() line my_line; my_line.m_Left.m_Xcoord = 5; my_line.m_Left.m_Ycoord = 8; ...
line my_line

20. structs within structs
struct point { float m_Xcoord; float m_Ycoord; }; struct line point m_Left; point m_Right; int main() line my_line; my_line.m_Left.m_Xcoord = 5; my_line.m_Left.m_Ycoord = 8; ...
line my_line
point m_Left
point m_Right

21. structs within structs
struct point { float m_Xcoord; float m_Ycoord; }; struct line point m_Left; point m_Right; int main() line my_line; my_line.m_Left.m_Xcoord = 5; my_line.m_Left.m_Ycoord = 8; ...
line my_line
point m_Left
float m_Xcoord
float m_Ycoord
point m_Right
float m_Xcoord
float m_Ycoord

22. structs within structs
struct point { float m_Xcoord; float m_Ycoord; }; struct line point m_Left; point m_Right; int main() line my_line; my_line.m_Left.m_Xcoord = 5; my_line.m_Left.m_Ycoord = 8; ...
line my_line
point m_Left
float m_Xcoord
float m_Ycoord
point m_Right
float m_Xcoord
float m_Ycoord

23. structs within structs
struct point { float m_Xcoord; float m_Ycoord; }; struct line point m_Left; point m_Right; int main() line my_line; my_line.m_Left.m_Xcoord = 5; my_line.m_Left.m_Ycoord = 8; ...
line my_line
point m_Left
float m_Xcoord
float m_Ycoord
point m_Right
float m_Xcoord
float m_Ycoord

24. structs within structs
struct point { float m_Xcoord; float m_Ycoord; }; struct line point m_Left; point m_Right; int main() line my_line; my_line.m_Left.m_Xcoord = 5; my_line.m_Left.m_Ycoord = 8; ...
line my_line
point m_Left
float m_Xcoord
float m_Ycoord
point m_Right
float m_Xcoord
float m_Ycoord

25. structs within structs
struct point { float m_Xcoord; float m_Ycoord; }; struct line point m_Left; point m_Right; int main() line my_line; my_line.m_Left.m_Xcoord = 5; my_line.m_Left.m_Ycoord = 8; ...
line my_line
point m_Left
float m_Xcoord
float m_Ycoord
point m_Right
float m_Xcoord
float m_Ycoord

26. structs within structs
struct point { float m_Xcoord; float m_Ycoord; }; struct line point m_Left; point m_Right; int main() line my_line; my_line.m_Left.m_Xcoord = 5; my_line.m_Left.m_Ycoord = 8; ...
line my_line
point m_Left
float m_Xcoord
float m_Ycoord 5
point m_Right
float m_Xcoord
float m_Ycoord

27. structs within structs
struct point { float m_Xcoord; float m_Ycoord; }; struct line point m_Left; point m_Right; int main() line my_line; my_line.m_Left.m_Xcoord = 5; my_line.m_Left.m_Ycoord = 8; ...
line my_line
point m_Left
float m_Xcoord
float m_Ycoord 5 8
point m_Right
float m_Xcoord
float m_Ycoord

28. Another Example
struct car_part { string m_description; long m_partNumber; float m_wholesalePrice; float m_retailPrice; string m_color; etc };

29. Forward Declarations
struct point; struct line { point m_Left; ... }; struct point

30. Forward Declarations
struct point; struct line { point m_Left; ... }; struct point

31. Pro Tips
struct complex_number { float m_RealPart; float m_ImaginaryPart; string m_name; }

32. Pro Tips
struct complex_number { float m_RealPart; float m_ImaginaryPart; string m_name; }

33. Pro Tips
struct complex_number { float m_RealPart; float m_ImaginaryPart; string m_name; }

34. Pro Tips
struct complex_number { float m_RealPart; float m_ImaginaryPart; };

35. End of Session