1. EECE.2160 ECE Application Programming
Instructor:
Dr. Michael Geiger
Fall 2017
Lecture 28:
PE4: Structures

2. ECE Application Programming: Lecture 28
Lecture outline
Announcements/reminders
Program 6 graded; regrades due 11/29
Program 7 posted; due 11/20
Programs submitted 11/21-11/26 “1 day late”
Late penalties begin increasing again on 11/27
Today’s class
Review: Nested structures
PE4: Structures
4/4/2019
ECE Application Programming: Lecture 28

3. Review: Nested structures
Structures can contain other structures:
typedef struct {
char first[50]; // First name
char middle; // Middle initial
char last[50]; // Last name
} Name;
Name sname; // Student name
unsigned int ID; // ID #
double GPA; // Grade point
} SINew;
Will need multiple dot operators to access field within nested structure
Given SINew s1;
s1.sname  Name structure within s1
s1.sname.middle  middle initial of name within s1
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ECE Application Programming: Lecture 28

4. ECE Application Programming: Lecture 28
Today’s exercise
Given header files, main program
Complete specified functions
For the Name structure
void printName(Name *n): Print the name pointed to by n, using format <first> <middle>. <last>
void readName(Name *n): Prompt for and read a first, middle, and last name, and store them in the structure pointed to by n
SINew functions on next slide
4/4/2019
ECE Application Programming: Lecture 28

5. Today’s exercise (continued)
Given header files, main program
Complete specified functions
Name functions on previous slide
For the SINew structure
void printStudent(SINew *s): Print information about the student pointed to by s
void readStudent(SINew *s): Prompt for and read information into the student pointed to by s
void printList(SINew list[], int n): Print the contents of an array list that contains n StudentInfo structures
int findByLName(SINew list[], int n, char lname[]): Search for the student with last name lname in the array list. Return the index of the structure containing that last name, or -1 if not found
int findByID(SINew list[], int n, unsigned int sID): Search for the student with ID # sID in the array list. Return the index of the structure containing that last name, or -1 if not found
4/4/2019
ECE Application Programming: Lecture 28

6. ECE Application Programming: Lecture 28
Name functions
void printName(Name *n) { printf("%s %c. %s\n", n->first, n->middle, n->last); } void readName(Name *n) { printf("Enter name: "); scanf("%s %c. %s", n->first, &n->middle, n->last);
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ECE Application Programming: Lecture 28

7. Single SINew functions
void printStudent(SINew *s) { printName(&s->sname); printf("ID #%.8u\n", s->ID); printf("GPA: %.2lf\n", s->GPA); }
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ECE Application Programming: Lecture 28

8. Single SINew functions (cont.)
void readStudent(SINew *s) { readName(&s->sname); printf("Enter ID #: "); scanf("%u", &s->ID); printf("Enter GPA: "); scanf("%lf", &s->GPA); }
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ECE Application Programming: Lecture 28

9. ECE Application Programming: Lecture 28
printList()
void printList(SINew list[], int n) { int i; // Loop index for (i = 0; i < n; i++) { printStudent(&list[i]); printf("\n"); } }
4/4/2019
ECE Application Programming: Lecture 28

10. ECE Application Programming: Lecture 28
findByLName()
int findByLName(SINew list[], int n, char lname[]) { int i; // Loop index // Search for student with matching name // in list for (i = 0; i < n; i++) { if (strcmp(lname, list[i].sname.last) == 0) return i; } // If end of loop reached, student wasn’t // found return -1;
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ECE Application Programming: Lecture 28

11. ECE Application Programming: Lecture 28
findByID()
int findByID(SINew list[], int n,
unsigned int sID) {
int i; // Loop index
// Search for student with matching ID in list
for (i = 0; i < n; i++) {
if (sID == list[i].ID)
return i; }
// If end of loop reached, student wasn’t
// found
return -1;
4/4/2019
ECE Application Programming: Lecture 28

12. ECE Application Programming: Lecture 28
Next time
File I/O
Reminders:
Program 6 graded; regrades due 11/29
Program 7 posted; due 11/20
Programs submitted 11/21-11/26 “1 day late”
Late penalties begin increasing again on 11/27
4/4/2019
ECE Application Programming: Lecture 28