src2/section2.0/section2/main.m // main.m // Students7 // David J. Malan // Harvard University // // Demonstrates mutable arrays.

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1 src2/section0/section2/main.m main.m Students7 David J. Malan Harvard University malan@harvard.edu Demonstrates mutable arrays. #import <Foundation/Foundation.h> #import "Student.h" prototype void greet(student *s); int main(int argc, const char * allocate array for students NSMutableArray *students = [[NSMutableArray alloc] init]; Alice Student *alice = [[Student alloc] initwithname:@"alice" andage:20]; [students addobject:alice]; Bob [students addobject:[[student alloc] initwithname:@"bob" andage:21]]; greet then release each student for (Student *s in students) greet(s); return 0; greets student (via stderr) void greet(student *s) NSLog(@"Hello, %@. I see that you are %d years old.\n", s.name, s.age);

2 src2/section0/section2/student.h Student.h Students7 David J. Malan Harvard University malan@harvard.edu Declares a student with init methods. #import Student : (assign, nonatomic, readwrite) int (copy, nonatomic, readwrite) NSString *name; - (id)initwithname:(nsstring *)name andage:(int)age;

3 src2/section0/section2/student.m Student.m Students7 David J. Malan Harvard University malan@harvard.edu Defines a student with init methods. #import name=_name; - (id)init self = [self initwithname:@"john" andage:404]; return self; - (id)initwithname:(nsstring *)name andage:(int)age if (self = [super init]) self.age = age; self.name = name; return self;

4 src2/section1/section2/main.m main.m Students7 David J. Malan Harvard University malan@harvard.edu Demonstrates mutable arrays. #import <Foundation/Foundation.h> #import "Student.h" #import "TF.h" prototype void greet(student *s); int main(int argc, const char * allocate array for students NSMutableArray *students = [[NSMutableArray alloc] init]; Alice Student *alice = [[Student alloc] initwithname:@"alice" andage:20]; [students addobject:alice]; Bob [students addobject:[[student alloc] initwithname:@"bob" andage:21]]; TF *chris = [[TF alloc] initwithname:@"chris" students:students favorite:alice]; NSLog(@"%@", chris.favorite.name); Student *david = [[Student alloc] init]; david.name david.age = 34; [students addobject:david]; [chris grade]; [chris outputgrades]; [chris addofficehours:[nsdate datewithnaturallanguagestring:@"2/29/2012"]]; [chris addofficehours:[nsdate datewithnaturallanguagestring:@"3/7/2012"]]; [chris outputofficehours];

5 src2/section1/section2/main.m return 0; greets student (via stderr) void greet(student *s) NSLog(@"Hello, %@. I see that you are %d years old.\n", s.name, s.age);

6 src2/section1/section2/student.h Student.h Students7 David J. Malan Harvard University malan@harvard.edu Declares a student with init methods. #import Student : (assign, nonatomic, readwrite) int (copy, nonatomic, readwrite) NSString *name; - (id)initwithname:(nsstring *)name andage:(int)age;

7 src2/section1/section2/student.m Student.m Students7 David J. Malan Harvard University malan@harvard.edu Defines a student with init methods. #import name=_name; - (id)init self = [self initwithname:@"john" andage:404]; return self; - (id)initwithname:(nsstring *)name andage:(int)age if (self = [super init]) self.age = age; self.name = name; return self;

8 src2/section1/section2/tf.h TF.h Section2 Created by Christopher Gerber on 2/29/ Copyright (c) 2012 Harvard. All rights reserved. #import TF : (copy, nonatomic) NSString (strong, nonatomic, readwrite) NSMutableArray (strong, nonatomic, readwrite) NSMutableArray (strong, nonatomic, readwrite) Student (strong, nonatomic, readwrite) NSDictionary *grades; - (id)initwithname:(nsstring *)newname students:(nsmutablearray *)newstudents favorite:(student *)newfavorite; - (void)grade; - (void)outputgrades; - (void)addofficehours:(nsdate *)date; - (void)outputofficehours;

9 src2/section1/section2/tf.m TF.m Section2 Created by Christopher Gerber on 2/29/ Copyright (c) 2012 Harvard. All rights reserved. #import "TF.h" #import "Student.h" #import name=_name, students=_students, ohs=_ohs, favorite=_favorite, grades=_grades; - (id)initwithname:(nsstring *)newname students:(nsmutablearray *)newstudents favorite:(student *)newfavorite if (self = [super init]) self.name = newname; self.students = newstudents; self.favorite = newfavorite; self.grades = [[NSMutableDictionary alloc] init]; self.ohs = [[NSMutableArray alloc] init]; return self; - (void)grade srand(time(null)); for (Student *student in self.students) int grade = rand() % 4; if ([student.name isequaltostring:self.favorite.name]) grade = 4; [self.grades setvalue:[nsnumber numberwithint:grade] forkey:student.name]; - (void)outputgrades NSLog(@"Grades:"); for(id student in self.grades) NSLog(@"%@: %@", student, [self.grades objectforkey:student]); - (void)addofficehours:(nsdate *)date [self.ohs addobject:date];

10 src2/section1/section2/tf.m (void)outputofficehours NSLog(@"Office Hours:"); NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setdatestyle:nsdateformatterlongstyle]; for (NSDate *oh in self.ohs) NSLog(@"%@", [formatter stringfromdate:oh]);

11 src2/section2/section2/main.m main.m Students7 David J. Malan Harvard University malan@harvard.edu Demonstrates mutable arrays. #import <Foundation/Foundation.h> #import "Student.h" #import "Student+Description.h" #import "TF.h" prototype void greet(student *s); int main(int argc, const char * allocate array for students NSMutableArray *students = [[NSMutableArray alloc] init]; Alice Student *alice = [[Student alloc] initwithname:@"alice" andage:20]; [students addobject:alice]; Bob [students addobject:[[student alloc] initwithname:@"bob" andage:21]]; TF *chris = [[TF alloc] initwithname:@"chris" students:students favorite:alice]; NSLog(@"%@", chris.favorite.name); Student *david = [[Student alloc] init]; david.name david.age = 34; NSLog(@"%@", [david description]); [students addobject:david]; [chris grade]; [chris outputgrades]; [chris addofficehours:[nsdate datewithnaturallanguagestring:@"2/29/2012"]]; [chris addofficehours:[nsdate datewithnaturallanguagestring:@"3/7/2012"]];

12 src2/section2/section2/main.m [chris outputofficehours]; return 0; greets student (via stderr) void greet(student *s) NSLog(@"Hello, %@. I see that you are %d years old.\n", s.name, s.age);

13 src2/section2/section2/student+description.h Student+Description.h Section2 Created by Christopher Gerber on 2/29/ Copyright (c) 2012 Harvard. All rights reserved. #import Student (Description) - (NSString *)description;

14 src2/section2/section2/student+description.m 1 1 Student+Description.m Section2 Created by Christopher Gerber on 2/29/ Copyright (c) 2012 Harvard. All rights reserved. #import Student (Description) - (NSString *)description return [NSString stringwithformat:@"name: %@\nage: %d\n", self.name, self.age];

15 src2/section2/section2/student.h Student.h Students7 David J. Malan Harvard University malan@harvard.edu Declares a student with init methods. #import Student : (assign, nonatomic, readwrite) int (copy, nonatomic, readwrite) NSString *name; - (id)initwithname:(nsstring *)name andage:(int)age;

16 src2/section2/section2/student.m Student.m Students7 David J. Malan Harvard University malan@harvard.edu Defines a student with init methods. #import name=_name; - (id)init self = [self initwithname:@"john" andage:404]; return self; - (id)initwithname:(nsstring *)name andage:(int)age if (self = [super init]) self.age = age; self.name = name; return self;

17 src2/section2/section2/tf.h TF.h Section2 Created by Christopher Gerber on 2/29/ Copyright (c) 2012 Harvard. All rights reserved. #import TF : (copy, nonatomic) NSString (strong, nonatomic, readwrite) NSMutableArray (strong, nonatomic, readwrite) NSMutableArray (strong, nonatomic, readwrite) Student (strong, nonatomic, readwrite) NSDictionary *grades; - (id)initwithname:(nsstring *)newname students:(nsmutablearray *)newstudents favorite:(student *)newfavorite; - (void)grade; - (void)outputgrades; - (void)addofficehours:(nsdate *)date; - (void)outputofficehours;

18 src2/section2/section2/tf.m TF.m Section2 Created by Christopher Gerber on 2/29/ Copyright (c) 2012 Harvard. All rights reserved. #import "TF.h" #import "Student.h" #import name=_name, students=_students, ohs=_ohs, favorite=_favorite, grades=_grades; - (id)initwithname:(nsstring *)newname students:(nsmutablearray *)newstudents favorite:(student *)newfavorite if (self = [super init]) self.name = newname; self.students = newstudents; self.favorite = newfavorite; self.grades = [[NSMutableDictionary alloc] init]; self.ohs = [[NSMutableArray alloc] init]; return self; - (void)grade srand(time(null)); for (Student *student in self.students) int grade = rand() % 4; if ([student.name isequaltostring:self.favorite.name]) grade = 4; [self.grades setvalue:[nsnumber numberwithint:grade] forkey:student.name]; - (void)outputgrades NSLog(@"Grades:"); for(id student in self.grades) NSLog(@"%@: %@", student, [self.grades objectforkey:student]); - (void)addofficehours:(nsdate *)date [self.ohs addobject:date];

19 src2/section2/section2/tf.m (void)outputofficehours NSLog(@"Office Hours:"); NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setdatestyle:nsdateformatterlongstyle]; for (NSDate *oh in self.ohs) NSLog(@"%@", [formatter stringfromdate:oh]);