Difference between revisions of "Lecture22ECE264Spring2012" - Rhea

Revision as of 13:00, 7 April 2012

John Ribeiro - Professor Lu 8:30 - 9:20 - Lesson 22

Node * List_serach ( NOde * led, int v ) {

 while ( ( led != NULL ) && ( ( led->value ) != v ) )
 {
   led = led -> next;
 }
 return led;

}

/* Remember to check if the pointer is equal to NULL. This makes sure that the list exists in the first place. */

Node * List_InsertFront ( Node * head, int v ) {

 Node * n = Node_construct(v);
 n->next = head;
 return n;

}

Node * List_insertEnd ( Node * head, int v ) {

 Node * n = Node_construct(v);
 if ( head == NULL )
 {
   return n;
 }

/* If the list is empty create only one node */

 Node * p = head;

 while ( ( p->next) != NULL )
 {
   p = p -> next;
 }
 p->next = n;
 return head;

}

Node * List_delete ( Node * head, int v ) {

 if ( head == NULL )
 {
   return NULL;
 }

 Node * p = head;

 while ( ( q != NULL ) && ( ( q->value) != v ) )
 {
   p = q;
   q = q->next;
 }

 if ( q != NULL )
 {
   p->next = q->next;
   free ( q );
 }

 return head;

}

• • Exam 2 -> 8 - 10 PM this Thursday **

EE 206/207 open book and open note Will cover: 1) File 2) Structure 3) Linked List 4) Recursion

Possibly more questions and 1.5 times longer than exam 1

In main:

Node * head = NULL; head = List_insert ( head, 2 );

Node * p; p = List_search ( head, 6 );

if ( p != NULL ) {

 /* The value is found */

}

4/3/2012 Lecture 22_Kailu Song

Node *List_search(Node *t, int v) { while((t != NULL) && (t->value) != v) { t = t->next; } return t; }

Node *List_insertFront(Node *head, int v) { Node *n = Node_construct(v); n->next = head; return n; }

Node *List_insertEnd(Node *t, int v) { Node *n = Node_construct(v); if (t == NULL) { return n; } Node *p = t; while ((p->next) != NULL) { p = p-> next; } return t; }

Node *List_delete(Node *head, int v) { if (head == NULL) { return NULL; } Node *p = head; if ((head ->value) == v) { p = head -> next; free(head); return p; } }

Node *q = p-> next;/*p is not NULL */ while ((q != NULL)&&(q ->value) != v) { p = q; q = q->next; } if (q != NULL) { p->next = q -> next; free(q); } return head; }

main: Node *head = NULL;(initialize) head = list_insertFront/End (head, 2); head = list_delete(head,9);

4/4/2012 Huayi Guo Lecture 22 Professor Niklas Elmqvist

/*

 exam 
 
 Q1: file I/O;
 Q2: structure;
 Q3: linked list;
 Q4: recursion;
 BE SURE TO LOOK AT YOUR ASSIGNMENTS AND EXERCISES
 
 shallow vs deep copy
 
 DEEP COPY is when you are copying not only of the pointer but also the contents that the pointer
 is pointing to.
 
 Example:
 */
 typedef enum{ MALE, FEMALE }Gender;
 struct Person{
 char * first;
 char * last;
 Gender gender;  

 }Person;
 
 Person Person_create(char * first, char * last, int age, Gender gender)
 {
     Person person;

person.first = strdup(first); person.last = strdup(last); person.age = age; person.gender = gender; return person;

 }
 
 void Person_destroy(Person person)
 {
    //you need to free the thing that created by strdup!!
    free(person.first);

free(person.last);

 }
 Person_copy(Person person)
 {
    return Person_create(preson.first, person.last, 

person.age, person.gender);

 }

 Person_addSuffix(Person person, char *middler)
 {
    char * tmp = malloc(strlen(person->last)_ strlen())
 
 }
 
 Person_print(Person person)
 {
   printf("first: %s, last %s, age: %d, gender: %s\n", person.first, person. last, person.age,

(person.gender == MALE ? "male":"female"));

 }
  
 int main(int argc, char: argv[])
{
   if(argc != 5){

return EXIT_FAILURE; }

int age = strtol(argv[3], NULL, 10); Gender gender = (strcmp(argv[4],"male")==0) ? MALE: FEMALE Person person1 = Person_create(argv[1], argv[2], age, gender);

     Pereon person2 = Person_copy(person1); //deep copy
    //Person person2 = person1 ;//shallow copy

   Person_print(person1);

Person_print(person2);

Person_destroy(person1); // Since person2 is deep copy you need to free it // If you do shallow copy then you DONT need to free it, //otherwise it's a segmentation fault Person_destroy(person2);

return EXIT_SUCCESS;

}  

/*

• /

===================

Kevin Tan(0023987592), section#2 notes 04/05

random access

arr[5]; arr[9];

FILE *fp= NULL; fp = fopen(filename,"rb");

int a; double b; fread(&a,sizeof(int),1,fp); fread(&b,sizeof(double),1,fp); . . fscanf(fp,"%d%d",&a,&b);