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//
// main.m
// OC10变量数据类型
//
// Created by Zoujie on 15/9/4.
// Copyright (c) 2015年 Zoujie. All rights reserved.
//
enum flag
{
FIREST,
SECOND,
THIRD,
FOURTH=5,
FIFTH,
}ENDOFDATA;
//未命名的枚举类型
enum {
up,
down,
left = 10,
right,
};
enum boolean
{
no = 0,
false = 0,
yes = 1,
ture = 1,
};
enum Month
{
january = 1,
february,
march ,
april,
may ,
june,
july,
august,
september,
october,
november,
december
};
typedef int Counter;//增加了变量定义的可读性
typedef enum{
east,
west,
north,
south
}Direction ;
#import <Foundation/Foundation.h>
#import "Fraction.h"
typedef Fraction * NumberObject;
typedef Fraction * FractionObj;
int main(int argc, const char * argv[]) {
@autoreleasepool {
Fraction *myFtactin = [[Fraction alloc]init];
[myFtactin setTo:10 over:20];
Fraction *a = [[Fraction alloc]init];
Fraction *b = [[Fraction alloc]init];
[a setTo:1 over:3];
[b setTo:3 over:7];
[a print];
[b print];
NSLog(@"Fractions allocated :%i",[Fraction count]);
a = [[Fraction allocF] init];
b = [[Fraction allocF] init];
Fraction *c = [[Fraction allocF] init];
NSLog(@"Fractions allocated :%i",[Fraction count]);
//枚举
// enum flag {FIREST,SECOND,THIRD};
switch (ENDOFDATA) {
case FIREST:
NSLog(@"first==%d",FIREST);
break;
case SECOND:
NSLog(@"second");
break;
case THIRD:
NSLog(@"third");
break;
case FOURTH:
NSLog(@"fourth");
break;
case FIFTH:
NSLog(@"fifth");
break;
default:
break;
}
enum flag ONE,TWO;
if (ONE){NSLog(@"ONE");};
if (TWO){NSLog(@"TWO");};
enum Month amoth;
int days;
NSLog(@"Enter month number:");
scanf("%i",&amoth);
switch (amoth) {
case january:
case april:
case may:
case june:
case july:
case august:
case october:
case december:
days = 31;
break;
case march:
case september:
case november:
days = 30;
break;
case february:
days = 28;
break;
default:
NSLog(@"bad month number");
days = 0;
break;
}
if (days != 0)NSLog(@"Number of days is %i",days);
if (amoth == february)NSLog(@"...or 29 if it‘s a leap year");
Counter x = 2 , y = 3;
NSLog(@"%d",x);
NumberObject myValue1,myValue2,myValue3;//定义的三个Fraction对象
Direction stpe1,stpe2;
switch (stpe1)
{
case east:
NSLog(@"%i",east);
break;
default:
break;
}
FractionObj f1 = [[Fraction alloc]init];
FractionObj f2 = [[Fraction alloc]init];
}
return 0;
}
//
// Fraction.h
// OC10变量数据类型
//
// Created by Zoujie on 15/9/4.
// Copyright (c) 2015年 Zoujie. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface Fraction : NSObject
{
}
@property (nonatomic ,assign) NSInteger a;
@property (nonatomic ,assign) NSInteger b;
-(void)setTo:(int)a over:(int) b;
-(instancetype)initWith:(int) a over:(int) b;//自定义初始化，所有的初始化方法都以init开头
-(void)print;
+(Fraction *)allocF;
+(int)count;
@end
//
// Fraction.m
// OC10变量数据类型
//
// Created by Zoujie on 15/9/4.
// Copyright (c) 2015年 Zoujie. All rights reserved.
//
#import "Fraction.h"
static int gGlobalVar = 0; //静态变量
static int gCounter;
@implementation Fraction
-(instancetype)init//重载init方法
{
self = [super init];//首先调用父类的init方法
if (self)
{
NSLog(@"111111");
}
return self;
}
-(Fraction *)initWith:(int) a over:(int) b
{
self = [super init];
if (self)
{
[self setTo:a over:b];
}
return self;
}
-(void)setTo:(int)a over:(int)b
{
_a = a;
_b = b;
}
-(void)print
{
NSLog(@"%ld/%ld",_a,_b);
}
+(Fraction *)allocF
{
extern int gCounter;
++gCounter;
return [Fraction alloc];
}
+(int) count
{
extern int gCounter;
return gCounter;
}
@end
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原文地址：http://my.oschina.net/u/2319073/blog/501146
