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1. OBJECT ORIENTED PROGRAMMING
 Objective-C is an object oriented language.
follows ANSI C style coding with methods
 There is no formal written standard
Relies mostly on libraries written by others
 Flexible almost everything is done at runtime.
Dynamic Binding
Dynamic Typing
Dynamic Linking

2. INVENTORS
• Objective-C was invented by two men, Brad Cox and Tom
Love.
• Both were introduced to Smalltalk at ITT in 1981
• Cox thought something like Smalltalk would be very useful to
application developers
• Cox modified a C compiler and by 1983 he had a working
Object-oriented extension to C called OOPC.

3. INVENTORS
• Tom Love acquired a commercial copy of Smalltalk-80 while
working for Schlumberger Research
• With direct access Smalltalk, Love added more to OOPC
making the final product, Objective-C.
• In 1986 they release Objective-C through their company
“Stepstone”

4. BASIC SYNTAX STRUCTURE
C++ syntax
void function(int x, int y, charz);
Object.function(x, y, z);
Objective-C syntax
-(void) function:(int)x, (int)y,
(char)z;
[Object function:x, y, z];

5. Class Declaration (Interface)
#import <Cocoa/Cocoa.h>
@interface Node : NSObject
{
Node *link;
int contents;
}
+(id)new;
-
(void)setContent:(int)numbe
r;
-(void)setLink:(Node*)next;
-(int)getContent;
-(Node*)getLink;
@end

6. Class Definition (Implementation)
#import "node.h”
@implementation Node
+(id)new
{ return [Node alloc];}
-(void)setContent:(int)number
{contents = number;}
-(void)setLink:(Node*)next {
[link autorelease];
link = [next retain];
}
-(int)getContent
{return contents;}
-(Node*)getLink
{return link;}
@end

7. C++ VS. Objective-C
Adds OOP,
metaprogramming and
generic programming to C
Comes with a std library
Has numerous uses
Large and complex code
for OOP
Only adds OOP to C
Has no standard library;
is dependant on other
libraries
Mostly used for
application building
Simpler way of handling
classes and objects

8. Example: main.c
#import "stack.h”
int main(){
Stack *s = [Stack new];
[s push:1];
[s push:2];
printf("%dt", [s pop]);
[s push:3];
printf("%dt", [s pop]);
printf("%dt", [s pop]);
[s release];
return 0;
}
$ gcc -x objective-c node.m linkList.m stack.m main.c -
framework Cocoa -o stackTest
$./stackTest
2 3 1

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