The evolution of Pokemon society Structures COMP 102
- Slides: 14
The evolution of Pokemon society Structures
COMP 102 Prog. Fundamentals, Structures / Slide 2 “Good Old Days” At first it was Pokemon and his variables Name Id Gender Dept
“Old Days” Then there were more Pokemons and their variables COMP 102 Prog. Fundamentals, Structures / Slide 3 Name_1 Id_1 Gender_1 Name_2 Id_2 Dept_1 Gender_2 Dept_2
COMP 102 Prog. Fundamentals, Structures / Slide 4 “Old Days” And more… Name_1 Id_1 Name_2 Name_3 Id_3 Gender_1 Id_2 Gender_3 Dept_1 Gender_2 Dept_3 Dept_2
COMP 102 Prog. Fundamentals, Structures / Slide 5 “Old Days” And more… Name_1 Id_1 Gender_1 Name_2 Name_3 Id_3 Name_4 Id_2 Gender_3 Id_4 Dept_1 Gender_2 Dept_3 Gender_4 Dept_2
COMP 102 Prog. Fundamentals, Structures / Slide 6 “Old Days” And more and more Name_1 Id_1 Name_m Name_2 Name_3 Id_3 Name_4 Name_n Id_m Gender_1 Id_2 Gender_3 Id_4 Gender_m Dept_1 Gender_2 Dept_3 Gender_4 Gender_n Dept_4 Dept_2
COMP 102 Prog. Fundamentals, Structures / Slide 7 “What a mess! How can any Pokemon find his variables? We got to get organized!” Every Pokemon’s variable should stay together!
COMP 102 Prog. Fundamentals, Structures / Slide 8 New World Order: An almost perfect world! Pokemon_1 Pokemon_2 Pokemon_3 Pokemon_n Name Id Dept Gender
COMP 102 Prog. Fundamentals, Structures / Slide 9 struct examples l l Example: struct Pokemon{ char Name[15]; int Id; char Dept[5]; char Gender; }; The “Pokemon” structure has 4 members.
COMP 102 Prog. Fundamentals, Structures / Slide 10 struct basics l Declaration of a variable of struct type: <struct-type> <identifier_list>; l Example: Pokemon_1, Pokemon_2; Name Pokemon_1 Id Dept Name Gender Id Gender Pokemon_2 Dept and Pokemon_2 are variables of Pokemon type. Pokemon_1
COMP 102 Prog. Fundamentals, Structures / Slide 11 Ex. 1: struct basics l The members of a struct type variable are accessed with the dot (. ) operator: Pokemon_1 <struct-variable>. <member_name>; l Example: strcpy(Pokemon_1. Name, "Chan Tai Man"); Pokemon_1. Id = 12345; strcpy(Pokemon_1. Dept, "COMP"); Pokemon_1. gender = 'M'; cout << "The student is "; switch (Pokemon_1. gender){ case 'F': cout << "Ms. "; break; case 'M': cout << "Mr. "; break; } cout << Pokemon_1. Name << endl; Name Id Gender Dept Chan Tai Man 12345 COMP M
COMP 102 Prog. Fundamentals, Structures / Slide 12 Ex. 2: struct-to-struct assignment l l The value of one struct type variable can be assigned to another variable of the same Pokemon_1 struct type. Example: Chan Tai Man strcpy(Pokemon_1. Name, "Chan Tai Man"); Pokemon_1. Id = 12345; strcpy(Pokemon_1. Dept, "COMP"); Pokemon_1. gender = 'M'; 12345 Pokemon_2 = Pokemon_1; Chan Tai Man COMP 12345 Pokemon_2 M COMP M
COMP 102 Prog. Fundamentals, Structures / Slide 13 New World Order: An almost perfect world! Pokemon[0] Pokemon[1] Pokemon[2] Pokemon[n] Name Id Dept Gender
COMP 102 Prog. Fundamentals, Structures / Slide 14 Ex. 2: struct-to-struct assignment l l The value of one struct type variable can be assigned to another variable of the same Pokemon[1] struct type. Example: Chan Tai Man strcpy(Pokemon[1]. Name, "Chan Tai Man"); Pokemon[1]. Id = 12345; strcpy(Pokemon[1]. Dept, "COMP"); Pokemon[1]. gender = 'M'; 12345 Pokemon[2] = Pokemon[1]; Chan Tai Man COMP 12345 Pokemon[2] M COMP M
