inheritenace-test, Objective-C

inheritenace-test

//gcc 5.0.4

#import <Foundation/Foundation.h>

@interface Square:NSObject {
   //Instance variables
   double length;
}
@property(nonatomic, readwrite) double length;  // Property
@end

@interface Rectangle:Square {
   //Instance variables
   double width;
   double height;
}
@property(nonatomic, readwrite) double width;
@property(nonatomic, readwrite) double height;
@end

@implementation Square
@synthesize length;
-(id)init {
   self = [super init];
   length = 1.0;
   return self;
}
-(void) funcX {
    NSLog(@"My length is %f", length);
}
-(double) area {
   return length * length;
}
@end

@interface Square3M:Square {
}
@end

@implementation Rectangle
@synthesize width;
@synthesize height;
-(id)init {
   self = [super init];
   width = 1.0;
   height = 1.0;
   return self;
}
-(void) funcX {
    NSLog(@"My width is %f, height is %f", width, height);
}
-(double) area {
   return width * height;
}

-(void) funcY {
    [self funcX];
    [super funcX];
}
@end

@implementation Square3M
-(id)init {
   self = [super init];
   length = 3.0;
   return self;
}

-(void) funcZ {
    NSLog(@"My super length is %f", super.length);
}
@end

int main (int argc, const char * argv[])
{
    NSAutoreleasePool *myPool = [[NSAutoreleasePool alloc] init];
    
    NSLog(@"My Square");
    Square *mySquare = [[Square alloc] init];
    [mySquare funcX];
    NSLog(@"My Square Area is = %f", [mySquare area]);
    [mySquare autorelease];
    
    NSLog(@"My Rect");
    Rectangle *myRect = [[Rectangle alloc] init];
    [myRect funcX];
    NSLog(@"My Rect Area is = %f", [myRect area]);
    [myRect funcY];
    [myRect autorelease];
    
    NSLog(@"My Square3M");
    Square *mySquare3M = [[Square3M alloc] init];
    [mySquare3M funcX];
    NSLog(@"My Square3M Area is = %f", [mySquare3M area]);
    [mySquare3M funcZ];
    [mySquare3M autorelease];
    
    [myPool drain];
    return 0;
}


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