Object-C 基础学习笔记(基本类型、集合)

////  Created by Potter on 14/11/13.//  Copyright (c) 2014年 Potter. All rights reserved.//#import <Foundation/Foundation.h>#import "Student.h"int main(int argc, const char * argv[]) {    NSLog(@"------------------基本数据类型定义--------------------");    //基本类型定义    int i =10;    short s = 1;    float f = 1.34f;    double d = 2.23112;    NSString* str = @"string";        //连接字符串    NSString* newStr = [str stringByAppendingString:@"dfg"];        NSLog(@"i=%i,s=%hi,f=%f,d=%f,str=%@,newStr=%@",i,s,f,d,str,newStr);        NSLog(@"-------------------集合类型定义---------------------");        NSLog(@"-------------------C数组定义---------------------");    //集合类型定义    int iarray[8]={1,2,3,4,5,6,7,8};    for(int i=0;i<sizeof(iarray)/sizeof(int);i++)    {        printf("i=%i,",iarray[i]);    }    NSLog(@"iarraySize=%lu,intSize=%lu",sizeof(iarray),sizeof(int));        NSLog(@"-------------------【NSArray】不可变数组类---------------------");        //1.【NSArray】不可变数组类---相当数组    NSArray* days = [NSArray arrayWithObjects:@"Mondy",@"Tue",@"Wed",@"Thu",@"Fri",@"Sat",@"Sun",nil];    NSArray* days1 = @[@"one",@"two"];    NSArray* days2 = [NSArray new];    NSLog(@"days count=%lu",(unsigned long)[days count]);        //第一种for循环-遍历    for(int i=0;i<[days count];i++)    {        NSLog(@"%@,",[days objectAtIndex:i]);    }    NSLog(@"----------------------------------------");        //第二种for循环-遍历    for(id day in days1)    {        NSLog(@"%@",day);    }        NSLog(@"------------------【NSMutableArray】可变数组类----------------------");    //2.【NSMutableArray】可变数组类---相当list,vector    NSMutableArray* mutableArry = [NSMutableArray arrayWithCapacity:1];//只是默认了初始容量，尺寸大小会随数量增加而变大的    NSMutableArray* mutableArry2 =[[NSMutableArray alloc] initWithCapacity:3];    NSMutableArray* mutableArry3 = [NSMutableArray new];    //增加元素    [mutableArry addObject:@"item1"];    [mutableArry addObject:@"item2"];    [mutableArry addObject:@"item3"];        //正常输出元素    for(id item in mutableArry)    {        NSLog(@"item=%@",item);    }        NSLog(@"mutableArray Size=%lu",[mutableArry count]);        //替换元素    [mutableArry replaceObjectAtIndex:0 withObject:@"replace1 item1"];    mutableArry[1] =@"replace2 item2";        //移除最后一个元素    [mutableArry removeLastObject];        for(id item in mutableArry)    {        NSLog(@"item=%@",item);        NSLog(@"item=%@",item);    }    NSLog(@"------------------【NSDictionary】不可变字典----------------------");    //3.【NSDictionary】不可变字典NSDictionary---相当map    NSDictionary *dictionay = [NSDictionary dictionaryWithObjectsAndKeys:@"value1", @"key1", @"value2", @"key2", nil];    id value = [dictionay objectForKey:@"key1"];    NSLog(@"key1 => %@", value);        NSLog(@"------------------【NSMutableDictionary】可变字典----------------------");    //3.【NSMutableDictionary】可变字典NSDictionary---相当map    NSMutableDictionary *mulDictionary = [NSMutableDictionary dictionaryWithCapacity:3];    NSMutableDictionary* mutableDictionary= [NSMutableDictionary new];    //添加元素    [mutableDictionary setValue:@"value1" forKey:@"key1"];    [mutableDictionary setObject:@"value2" forKey:@"key2"];        NSArray* dictionaryKeys1 = [mutableDictionary allKeys];    for(id key in mutableDictionary)    {        NSLog(@"key=>%@,value=%@",key,[mutableDictionary objectForKey:key]);    }    //替换元素    [mutableDictionary setObject:@"replace value2" forKey:@"key2"];        NSLog(@"----------------------------------------");    for(id key in mutableDictionary)    {        NSLog(@"key=>%@,value=%@",key,[mutableDictionary objectForKey:key]);    }        //删除    NSLog(@"----------------------------------------");    dictionaryKeys1 = [mutableDictionary allKeys];    [mutableDictionary removeObjectForKey:@"key1"];    for(id key in mutableDictionary)    {        NSLog(@"key=>%@,value=%@",key,[mutableDictionary objectForKey:key]);    }    return 0;}

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