What am I doing wrong in this peace of code
Hi All,
I'm currently reading "Learn Objective-c on the mac" (I have finished "Learn C on the mac").
The code beneith is from the makers of the book. When I run this code in Xcode there are two problems.
Just run and you will see (I don't understand the meaning of the problem, so it's hard to explain it here).
My version of Xcode is 4.4.1
#import <Foundation/Foundation.h>
// --------------------------------------------------
// constants for the different kinds of shapes and their colors
typedef enum {
kRedColor,
kGreenColor,
kBlueColor
} ShapeColor;
// --------------------------------------------------
// Shape bounding rectangle
typedef struct {
int x, y, width, height;
} ShapeRect;
// --------------------------------------------------
// convert from the ShapeColor enum value to a human-readable name
NSString *colorName (ShapeColor color)
{
switch (color) {
case kRedColor:
return @"red";
break;
case kGreenColor:
return @"green";
break;
case kBlueColor:
return @"blue";
break;
}
return @"no clue";
} // colorName
// --------------------------------------------------
// All about Circles
@interface Circle : NSObject
{
ShapeColor fillColor;
ShapeRect bounds;
}
- (void) setFillColor: (ShapeColor) fillColor;
- (void) setBounds: (ShapeRect) bounds;
- (void) draw;
@end // Circle
@implementation Circle
- (void) setFillColor: (ShapeColor) c
{
fillColor = c;
} // setFillColor
- (void) setBounds: (ShapeRect) b
{
bounds = b;
} // setBounds
- (void) draw
{
NSLog (@"drawing a circle at (%d %d %d %d) in %@",
bounds.x, bounds.y,
bounds.width, bounds.height,
colorName(fillColor));
} // draw
@end // Circle
// --------------------------------------------------
// All about Rectangles
@interface Rectangle : NSObject
{
ShapeColor fillColor;
ShapeRect bounds;
}
- (void) setFillColor: (ShapeColor) fillColor;
- (void) setBounds: (ShapeRect) bounds;
- (void) draw;
@end // Rectangle
@implementation Rectangle
- (void) setFillColor: (ShapeColor) c
{
fillColor = c;
} // setFillColor
- (void) setBounds: (ShapeRect) b
{
bounds = b;
} // setBounds
- (void) draw
{
NSLog (@"drawing a rectangle at (%d %d %d %d) in %@",
bounds.x, bounds.y,
bounds.width, bounds.height,
colorName(fillColor));
} // draw
@end // Rectangle
// --------------------------------------------------
// All about OblateSphereoids
@interface OblateSphereoid : NSObject
{
ShapeColor fillColor;
ShapeRect bounds;
}
- (void) setFillColor: (ShapeColor) fillColor;
- (void) setBounds: (ShapeRect) bounds;
- (void) draw;
@end // OblateSphereoid
@implementation OblateSphereoid
- (void) setFillColor: (ShapeColor) c
{
fillColor = c;
} // setFillColor
- (void) setBounds: (ShapeRect) b
{
bounds = b;
} // setBounds
- (void) draw
{
NSLog (@"drawing an egg at (%d %d %d %d) in %@",
bounds.x, bounds.y,
bounds.width, bounds.height,
colorName(fillColor));
} // draw
@end // OblateSphereoid
// --------------------------------------------------
// Draw the shapes
void drawShapes (id shapes[], int count)
{
int i;
for (i = 0; i < count; i++) {
id shape = shapes[i];
[shape draw];
}
} // drawShapes
// --------------------------------------------------
// The main function. Make the shapes and draw them
int main (int argc, const char * argv[])
{
id shapes[3];
ShapeRect rect0 = { 0, 0, 10, 30 };
shapes[0] = [Circle new];
[shapes[0] setBounds: rect0];
[shapes[0] setFillColor: kRedColor];
ShapeRect rect1 = { 30, 40, 50, 60 };
shapes[1] = [Rectangle new];
[shapes[1] setBounds: rect1];
[shapes[1] setFillColor: kGreenColor];
ShapeRect rect2 = { 15, 19, 37, 29 };
shapes[2] = [OblateSphereoid new];
[shapes[2] setBounds: rect2];
[shapes[2] setFillColor: kBlueColor];
drawShapes (shapes, 3);
return (0);
} // main
