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#import <Foundation/Foundation.h> @interface Shape : NSObject { CGFloat area; } -(void)printArea; -(void)calculateArea; @end @implementation Shape -(void)printArea { NSLog(@"The area is %f",area); } -(void)calculateArea { } @end @interface Square : Shape { CGFloat length; } -(id)initWithSide : (CGFloat)side; -(void)calculateArea; @end @implementation Square -(id)initWithSide : (CGFloat)side { length = side; return self; } -(void)calculateArea { area = length * length; } -(void)printArea { NSLog(@"The area of square is %f", area); } @end @interface Rectangle : Shape { CGFloat length; CGFloat breadth; } -(id)initWithLength: (CGFloat)rLen andBreadth:(CGFloat)rBreadth; @end @implementation Rectangle -(id)initWithLength: (CGFloat)rLen andBreadth:(CGFloat)rBreadth { length = rLen; breadth = rBreadth; return self; } -(void)calculateArea { area = length * breadth; } -(void)printArea { NSLog(@"The area of Rectangle is %f", area); } @end int main(int ar, const char * argv[]) { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init]; Shape *square = [[Square alloc]initWithSide:4.2]; [square calculateArea]; [square printArea]; Shape *rect = [[Rectangle alloc]initWithLength:7.88 andBreadth:6.35]; [rect calculateArea]; [rect printArea]; [pool drain]; return 0; }
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