objective-C 的Hello World!

 

//  main.m
//  HelloWorld
//  Created by jimmy.yang on 11-1-24.
//  Copyright 2011 __MyCompanyName__. All rights reserved.

#import <Foundation/Foundation.h>

//定义“几何形状类型”枚举
typedef enum{
  kCircle,
  kRectangle,
  kOblatesShperoid  
} ShapeType;

//定义“几何形状颜色”枚举
typedef enum{
  kRedColor,
  kGreenColor,
  kBlueColor
} ShapeColor;

//定义“几何形状矩形区域”结构
typedef struct{
  int x,y,width,height;
} ShapeRect;


//定义“几何形状”结构
typedef struct{
  ShapeType type;
  ShapeColor fillColor;
  ShapeRect bounds;
}Shape;


//返回“枚举颜色”的名称
NSString *colorName(ShapeColor colorName){
  switch (colorName) {
    case kRedColor:
      return @"red";
      break;
    case kGreenColor:
      return @"green";
      break;  
    case kBlueColor:
      return @"blue";
      break;  
    default:
      return @"no clue";
      break;
  }
}//colorName

//画圆
void drawCircle(ShapeRect bounds,ShapeColor fillColor){
  NSLog(@"drawing a circle at (%d,%d,%d,%d) in %@",bounds.x,bounds.y,bounds.width,bounds.height,colorName(fillColor));
}//drawCircle

//画矩形
void drawRectangle(ShapeRect bounds,ShapeColor fillColor){
  NSLog(@"drawing a rectangle at (%d,%d,%d,%d) in %@",bounds.x,bounds.y,bounds.width,bounds.height,colorName(fillColor));
}//drawRectangle

//画椭圆形
void drawEgg(ShapeRect bounds,ShapeColor fillColor){
  NSLog(@"drawing an egg at (%d,%d,%d,%d) in %@",bounds.x,bounds.y,bounds.width,bounds.height,colorName(fillColor));
}//drawEgg

//画几何形状
void drawShapes(Shape shapes[],int count){
  int i;
  for(i=0;i<count;i++){
    switch (shapes[i].type) {
      case kCircle:
        drawCircle(shapes[i].bounds,shapes[i].fillColor);
        break;
      case kRectangle:
        drawRectangle(shapes[i].bounds,shapes[i].fillColor);
        break;
      case kOblatesShperoid:
        drawEgg(shapes[i].bounds,shapes[i].fillColor);
        break;
      default:
        break;
    }
  }
}//drawShapes


//主程序入口
int main(int argc, char *argv[])
{  
    
  Shape shapes[3];
  
  ShapeRect rect0 ={0,0,10,30};
  shapes[0].type = kCircle;
  shapes[0].fillColor = kRedColor;
  shapes[0].bounds = rect0; 
  
  ShapeRect rect1 = {30,40,50,60};
  shapes[1].type = kRectangle;
  shapes[1].fillColor = kGreenColor;
  shapes[1].bounds = rect1;
  
  ShapeRect rect2 = {15,18,37,39};
  shapes[2].type = kOblatesShperoid;
  shapes[2].fillColor = kBlueColor;
  shapes[2].bounds = rect2; 
  
  drawShapes(shapes, 3);
  
  return (0);
}

Console窗口的运行结果：

2011-01-25 13:49:05.978 HelloWorld[734:a0f] drawing a circle at (0,0,10,30) in red

2011-01-25 13:49:06.016 HelloWorld[734:a0f] drawing a rectangle at (30,40,50,60) in green

2011-01-25 13:49:06.018 HelloWorld[734:a0f] drawing an egg at (15,18,37,39) in blue

作者：菩提树下的杨过