Class and Method declaration and definitions
Because of objective-C is the extension of ANSI-C and it follows an object
oriented approach so provides classes and objects. The way to declare and define
classes and creation of object is little bit different from C and C++.
To declare a new class objective-C uses @interface directive.
Declaration of a simple class: MyClass.h
#import"SuperClass.h" #import<headerFile.h> @interface ClassName:SuperClass {
variable daclaration;
variable daclaration;
}
method declaration;
method declaration;
@end
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#import<Foundation/NSObject.h>
@interface MyClass:NSObject{
int a;
int b;
}
-(void) setvara : (int) x;
-(void) setvarb : (int) y;
-(int) add;
@end
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Definition of declared class: MyClass.m
#import<stdio.h>
#import"MyClass.h"
@implementation MyClass
-(void) setvara :(int) x{
a=x;
}
-(void) setvarb :(int) y{
b=y;
}
-(int) add{
return a+b;
}
@end
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Piecing it together
main.m
#import<stdio.h>
#import"MyClass.m"
int main(){
MyClass *class = [[MyClass alloc]init];
[class setvara : 5];
[class setvarb : 6];
printf("Sum is : %d",[class add]);
[class release];
return ;
}
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