Student 1 name Somchai surname Jaidee age 18

ทำไมตองศกษาตวแปรลกษณะโครงสราง ? Student 1 name = “Somchai” surname = “Jai-dee” age = 18 gender = “Male” Student 2 name = “Sompong” surname = “Nong. Som. Chai” age = 17 gender = “Male” Student 3 name = “Somying” surname = “Na-rak” age = 18 gender = “Female” 4

รปแบบการประกาศโครงสรางขอมล ����� 1 struct type ……… type }; name { var_1; var_2; var_n; ����� 2 struct name { type var_1; type var_2; ……… type var_n; } struct_var; struct name struct_var; 7

ตวอยางการประกาศตวแปรชนดโครงสราง ����� 1 ����� 2 struct student { char name[15]; char surname[30]; int age; char gender[7]; }; struct student st 1, st 2; struct student { char name[15]; char surname[30]; int age; char gender[7]; } st 1, st 2; 8

การอางถงตวแปรในโครงสราง ����������� struct product { ��������� char name[15]; � int count; float price; ������ }; struct_var. var_name struct product pr 1, pr 2; ��������� name count ������ ". " pr 1. name pr 1. count ������ pr 2. name pr 2. count ��������� pr 1. name pr 1. count price pr 1. price pr 2. price 9

ตวอยางการกำหนดคาใหแกตวแปรในโ ครงสราง #include<stdio. h> salary bonus age #include<conio. h> people 1 16000 40000 23 int main() { struct income { float salary; float bonus; int age; }; struct income people 1; people 1. salary = 16000; people 1. bonus = 40000; people 1. age = 23; return 0; } 11

ตวอยางการกำหนดคาใหแกตวแปรในโ ครงสราง #include<stdio. h> #include<conio. h> #include<string. h> int main() { struct letter { char name[20]; char surname[30]; char message[50]; } first; printf scanf strcpy printf return ("Enter name : "); ("%s", first. name); ("Enter surname : "); ("%s", first. surname); (first. message, "Hi"); ("%s", first. message); ("n%s", first. name); (" %s", first. surname); 0; } 12

โปรแกรมเกบขอมลหนงสอ 1 เลม #include<stdio. h> #include<conio. h> int main() { struct book { char name[50]; float price; float discount; } book 1; printf ("Enter book name : "); gets (book 1. name); printf ("Enter book price : "); scanf ("%f", &book 1. price); book 1. discount = 0. 1*book 1. price; 14

โปรแกรมเกบขอมลหนงสอ 1 เลม printf ("nn. Book : %sn", book 1. name); printf ("Price : %. 2 fn", book 1. price); printf ("Discount 10 percent : %. 2 fn" "Total price : %. 2 f", book 1. discount, book 1. price - book 1. discount); return 0; } 15

struct profile student 1, student 2, student 3, student 4, student 5, student 6, student 7, student 8, student 9, student 10; student 2 student 10 name[20] age age grade struct profile student[10]; student[0] student[1] student[9] name[20] age age grade 18

ตวอยางอารเรยของตวแปรชนดโครงสร าง #include<stdio. h> #include<conio. h> int main() { struct profile{ char name[20]; int age; char grade; }; struct profile student[10]; return 0; } #include<stdio. h> #include<conio. h> int main() { struct profile{ char name[20]; int age; char grade; } student[10]; return 0; } 19

ตวอยางโปรแกรมเกบขอมลนกศกษา คน Student[0] name: joy age: 12 Student[1] name: boy age: 20 Student[2] name: jo age: 23 Student[3] name: pat age: 21 Student[4] name: ple age: 13 Student[5] name: tom age: 11 10 Student[6] name: tu age: 25 Student[7] name: tee age: 34 Student[8] name: bat age: 44 Student[9] name: phon age: 33 jo, 23 pat, 21 tu, 25 tee, 34 bat, 44 phon, 33 21

โปรแกรมเกบขอมลนกศกษา 10 คน #include<stdio. h> #include<conio. h> #include<string. h> int main() { int i; struct profile{ char name[20]; int age; } s[10]; 22

โปรแกรมเกบขอมลนกศกษา 10 คน for(i=0; i<10; i++) { printf("Student[%d]n", i); printf("t name: "); scanf("%s", s[i]. name); printf("t age: "); scanf("%d", &s[i]. age); } for(i=0; i<10; i++) if(s[i]. age > 20) printf("n %s, %d", s[i]. name, s[i]. age); return 0; } 23

สตรคเจอรซอนสตรคเจอร Structure) struct int char }; struct char }; name address{ num; moo; road[20]; district[20]; province[20]; (Nested struct student{ char name[20]; char surname[20]; char id[9]; sturct address add; struct phone tel; }; phone{ home[10]; mobile[10]; surname id add num moo road district province tel home mobile 25

ตวอยางสตรคเจอรซอนสตรคเจอร #include<stdio. h> #include<conio. h> #include<string. h> int main() { struct address{ int add; int moo; char road[20]; char district[20]; char province[20]; }; struct university{ char name[70]; struct address place; }; struct university king; 26

ตวอยางสตรคเจอรซอนสตรคเจอร strcpy (king. name, ”King Mongkut's Institute of Technology Ladkrabang”); king. place. add = 3; king. place. moo = 2; strcpy(king. place. road, ”Chalongkrung”); strcpy(king. place. district, ”Ladkrabang”); strcpy(king. place. province, ”Bangkok”); printf ("%sn", king. name); printf ("Address : %d Moo %d, %s Rd. n", king. place. add, king. place. moo, king. place. road); printf (" %s, %s", king. place. district, king. place. province); return 0; } 27

ตวอยางสตรคเจอรซอนสตรคเจอร King Mongkut's Institute of Technology Ladkrabang Address : 3 Moo 2, Chalongkrung Rd. Ladkrabang, Bangkok 28

คำถามทายบท 1. struct (1) product { char name[15]; int count; float price; }; struct product pr 1, pr 2; คำสงขอใดไมถกตอง 1. 3. 5. pr 1. count = 10; 2. pr 1. price = 130. 5; 4. pr 1. name = “Programming”; pr 2. count = 30; pr 2. price = 240. 75; 29