OC05_数组

来源：互联网发布：swift 自定义元素数组编辑：程序博客网时间：2024/06/06 13:00

// main.m

// OC06_数组

// Created by dllo on 15/7/20.

#import <Foundation/Foundation.h>

#import "Student.h"

#import "Book.h"

int main(int argc,constchar * argv[]) {

// int arr[5]={3,2,1,4,5};

// for (int i=0; i<5-1; i++) {

// for (int j=0; j<5-1-i; j++) {

// if (arr[j]>arr[j+1]) {

// int temp=0;

// temp=arr[j];

// arr[j]=arr[j+1];

// arr[j+1]=temp;

// }

//}

// for (int i=0; i<5; i++) {

// printf("%d ",arr[i]);

// }

//OC中的数组

//OC的数组里存放的一定是对象.

// NSArray *arr=[[NSArray alloc] init];

// NSArray *arr=[NSArray array];//便利构造器,没有参数,有参数时加with...

//1.字面量的方式创建一个数组

// NSArray *arr=@[@"4",@"2",@"3",@"1",@"5"];

// NSLog(@"%ld",arr.count);//数组里的元素个数

// NSLog(@"%ld个元素",[arr count]);

// //取值也是通过下标.返回的是一个对象.

// NSLog(@"%@",[arr objectAtIndex:2]);

// NSLog(@"%@",arr[2]);

//for循环进行数组遍历

// for (NSInteger i=0; i<arr.count; i++) {

// NSLog(@"%@",arr[i]);

// }

////不可变数组不能进行冒泡排序,,不能交换

// NSLog(@"%d",[arr containsObject:@"6"]);

// Student *stu1=[[Student alloc] initWithname:@"文世倾"];

// Student *stu2=[[Student alloc] initWithname:@"文世轩"];

// Student *stu3=[[Student alloc] initWithname:@"宁致远"];

// Student *stu4=[[Student alloc] initWithname:@"安乐颜"];

// NSArray *arr=[[NSArray alloc] initWithObjects:stu1,stu2,stu3,stu4, nil];

// for (NSInteger i=0; i<arr.count; i++) {

// Student *stu=arr[i];

// NSLog(@"%@",stu.name);

// }

// NSArray *arr1=[NSArray arrayWithObjects:stu1,stu2,stu3,stu4, nil];

// for (NSInteger i=0; i<arr.count; i++) {

// Student *stu=arr1[i];

// NSLog(@"%@",stu.name);

// }

//NSArray *arr=@[@"安逸臣",@"宁致远",@"文世倾",@"安乐颜"];

//NSLog(@"%@",arr);

//快速枚举:快速遍历数组等容器的对象.

//都是对容器里的每一个元素的遍历.

//为了增加代码的阅读性,避免不必要的错误,尽量让forin的前部分类型和数组里元素的类型相同.

// for (NSString *str in arr) {

// NSLog(@"%@",str);

// }

////数组嵌套

// NSArray *arr1=@[@"安逸臣",@"宁致远",@"文世倾",@"安乐颜"];

// NSArray *arr2=@[@"唐雪见",@"景天",@"紫萱",@"徐长卿"];

// NSArray *arr=@[arr1, arr2];

// //对arr进行forin遍历

// for (NSArray *temp in arr) {

// for (NSString *str in temp) {

// NSLog(@"%@",str);

// }

// Student *stu1=[[Student alloc] initWithname:@"文世倾"];

// Student *stu2=[[Student alloc] initWithname:@"文世轩"];

// Student *stu3=[[Student alloc] initWithname:@"宁致远"];

// Student *stu4=[[Student alloc] initWithname:@"安乐颜"];

// NSArray *arr1=@[stu1,stu2,stu3];

// NSArray *arr2=@[stu4];

// NSArray *arr=@[arr1,arr2];

// //遍历数组每一个学生的姓名

// for (NSArray *temp in arr) {

// for (Student *p in temp) {

// NSLog(@"%@",p.name);

// }

// NSArray *testarr=@[@"1",@"2",@"3"];

// NSArray *arr=[[NSArray alloc] initWithArray:testarr];

// NSArray *arr1=[[NSArray alloc]initWithObjects:testarr, nil];

// NSLog(@"%@",arr);

// NSLog(@"%@",arr1);

// NSLog(@"arr数组元素个数:%ld",arr.count);

// NSLog(@"arr1数组元素个数:%ld",[arr1 count]);

// NSArray *arr2=[NSArray arrayWithArray:arr];

//可变数组

//NSMutableArray *arr=[NSMutableArray array];//创建一个空的可变数组

//NSMutableArray *arr=[[NSMutableArray alloc] init];

// NSMutableArray *arr=[[NSMutableArray alloc] initWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7", nil];

// ///添加一个字符串

// [arr addObject:@"anyichen"];

// NSLog(@"添加一个字符串:%@",arr);

// ///移除下标2的字符串

// [arr removeObjectAtIndex:2];

// NSLog(@"移除下标2的字符串:%@",arr);

// ///插入一个字符串

// [arr insertObject:@"ningzhiyuan" atIndex:2];

// NSLog(@"插入一个字符串:%@",arr);

// ///替换一个字符串

// [arr replaceObjectAtIndex:4 withObject:@"wenshiqing"];

// NSLog(@"替换一个字符串:%@",arr);

// ///交换两个字符串

// [arr exchangeObjectAtIndex:3 withObjectAtIndex:2];

// NSLog(@"交换两个字符串:%@",arr);

// ///清空数组

// [arr removeAllObjects];

// NSLog(@"清空数组:%@",arr);

Book *book1=[Book bookWithName:@"湘西秘史" price:45.9];

Book *book2=[Book bookWithName:@"西游记" price:73.6];

Book *book3=[Book bookWithName:@"红楼梦" price:45.5];

Book *book4=[Book bookWithName:@"水浒传" price:100];

NSMutableArray *bookArr=[NSMutableArray arrayWithObjects:book1,book2,book3,book4,nil];

//1.数组可以添加、删除书籍。*************************************

Book *book5=[Book bookWithName:@"四书" price:35.6];

[bookArr addObject:book5];//添加

[bookArr removeObject:book2];//删除

// Book *temp=[bookArr objectAtIndex:2];

////打印:

for (Book *strin bookArr) {

NSLog(@"书名:%@,价格:%g",str.name,str.price);

}

NSLog(@"\n");

//2.可以从数组根据书名查找书籍,并修改书籍的价格*********************

for (Book *qin bookArr) {

if ([q.name isEqualToString:@"红楼梦"]) {

q.price=90.99;

}

////打印:

for (int i=0; i<bookArr.count; i++){

Book *p=bookArr[i];

NSLog(@"书名:%@,价格:%g",p.name,p.price);

}

NSLog(@"\n");

//3.展示所有书籍清单(书名)****************************************

////法1.

for (int i=0; i<bookArr.count; i++){

Book *p=bookArr[i];

NSLog(@"%@",p.name);

}

NSLog(@"\n");

////法2.

for (Book *strin bookArr) {

NSLog(@"书名:%@,价格:%g",str.name,str.price);

}

NSLog(@"\n");

//4.找到价格在70到100有多少本书,然后把符合条件的书放在一个数组里***********

//一定要创建空数组

NSMutableArray *newArr=[NSMutableArray array];

for (Book *hin bookArr) {

if (h.price>=70&&h.price<=100) {

//打印满足条件的书籍

NSLog(@"%@,%g",h.name,h.price);

//将满足条件的书籍放于数组newArr中.

[newArr addObject:h];

}

NSLog(@"\n");

//遍历数组newArr

for (Book *strin newArr) {

NSLog(@"书名:%@,价格:%g",str.name,str.price);

}

NSLog(@"\n");

//5.找到价格是100的书,把书名改成"论语"********************************

for (Book *win bookArr) {

if (w.price==100) {

w.name=@"论语";

}

for (Book *strin bookArr) {

NSLog(@"书名:%@,价格:%g",str.name,str.price);

}

////不可变数组变成可变数组***********************************************

NSLog(@"\n");

NSArray *arr4=@[@"1",@"2",@"3",@"4"];

NSMutableArray *muArr=[NSMutableArray arrayWithArray:arr4];

NSLog(@"%@",muArr);

return0;

}

/////////////////////Student类///////////////////////////

(1)

// Student.h

// OC06_数组

// Created by dllo on 15/7/20.

#import <Foundation/Foundation.h>

@interface Student : NSObject

@property(nonatomic,copy)NSString *name;

-(id)initWithname:(NSString *)name;

@end

(2)

// Student.m

// OC06_数组

// Created by dllo on 15/7/20.

#import "Student.h"

@implementation Student

-(id)initWithname:(NSString *)name{

self=[super init];

if (self) {

_name=name;

}

return self;

}

@end

/////////////Book///////////////////////////

(1)///

// Book.h

// OC06_数组

// Created by dllo on 15/7/21.

#import <Foundation/Foundation.h>

@interface Book : NSObject

@property(nonatomic,copy)NSString *name;

@property(nonatomic,assign)CGFloat price;

-(id)initWithName:(NSString *)name

price:(CGFloat)price;

+(id)bookWithName:(NSString *)name

price:(CGFloat)price;

@end

(2)//

// Book.m

// OC06_数组

// Created by dllo on 15/7/21.

#import "Book.h"

@implementation Book

-(id)initWithName:(NSString *)name

price:(CGFloat)price{

self=[super init];

if (self) {

_name=name;

_price=price;

}

return self;

}

+(id)bookWithName:(NSString *)name

price:(CGFloat)price{

Book *book=[[Book alloc] initWithName:name price:price];

return book;

}

@end

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