1 #import <Foundation/Foundation.h>
  2 
  3 int main(int argc, const char * argv[])
  4 {
  5     @autoreleasepool
  6     {
  7 #pragma mark - Test
  8 //        int a = 10;
  9 //        double b = 7.7;
 10 //        float c = 5.7;
 11 //        
 12 //        NSNumber *numberInt = [NSNumber numberWithInt:a];
 13 //        int a1 = [numberInt intValue];
 14 //        
 15 //        NSNumber *numberDou = [NSNumber numberWithDouble:b];
 16 //        double b1 = [numberDou doubleValue];
 17 //        
 18 //        NSNumber *numberFlo = [NSNumber numberWithFloat:c];
 19 //        float c1 = [numberFlo floatValue];
 20 //        
 21 //        NSLog(@"numberInt = %d, numberDou = %lf, numberFlo = %f", a1, b1, c1);
 22 //        
 23 //        NSString *str1 = @"Welcome";
 24 //        NSString *str2 = @"To";
 25 //        NSString *str3 = @"HuaShan";
 26 //        
 27 //        NSString *str4 = [[[[str1 stringByAppendingString:@" "] stringByAppendingString:str2] stringByAppendingString:@" "] stringByAppendingString:str3];
 28 //        //连接成功
 29 //        NSLog(@"%@", str4);
 30 //        
 31 //        NSString *str5 = [NSString stringWithFormat:@"%@ %@ %@", str1, str2, str3];
 32 //        //连接成功
 33 //        NSLog(@"%@", str5);
 34 //        
 35 //        NSString *str6 = [str1 stringByAppendingFormat:@" %@ %@", str2, str3];
 36 //        NSLog(@"%@", str6);
 37 //        
 38 //        //第一种
 39 //        NSString *str7 = [str4 substringToIndex:7];
 40 //        //第二种
 41 //        NSRange range = NSMakeRange(0, 7);
 42 //        NSString *str8 = [str4 substringWithRange:range];
 43 //        //第三种
 44 //        NSArray *arr = [str4 componentsSeparatedByString:@" "];
 45 //        NSLog(@"%@ %@ %@", str7, str8, arr[0]);
 46         
 47 #pragma mark - NSNumber
 48 //        double a = 8.8;
 49 //        //实例方法：用NSNumber存储基本数据类型
 50 //        NSNumber *num1 = [[NSNumber alloc] initWithDouble:a];
 51 //        //类方法
 52 //        NSNumber *num2 = [NSNumber numberWithDouble:a];
 53 //        NSLog(@"num1 = %@, num2 = %@", num1, num2);
 54 //        double a1 = [num1 doubleValue];
 55 //        double a2 = [num2 doubleValue];
 56 //        NSLog(@"a1 = %.2f, a2 = %.2f", a1, a2);
 57 //        
 58 //        NSString *str1 = @"Hello World";
 59 //        NSString *str2 = @"HuaShan";
 60 //        //连接两个字符串
 61 //        NSString *str3 = [[str1 stringByAppendingString:@" "] stringByAppendingString:str2];
 62 //        NSString *str4 = [NSString stringWithFormat:@"%@ %@", str1, str2];
 63 //        NSString *str5 = [str1 stringByAppendingFormat:@" %@", str2];
 64 //        NSLog(@"str3 = %@, str4 = %@, str5 = %@", str3, str4, str5);
 65 //        //去下标6之后的字符串
 66 //        NSString *subStr = [str1 substringFromIndex:6];
 67 //        NSLog(@"subStr = %@", subStr);
 68 //        //取下标5之前的字符串
 69 //        NSString *subStr1 = [str1 substringToIndex:5];
 70 //        NSLog(@"subStr1 = %@", subStr1);
 71 //        //取一定范围的字符串
 72 //        NSRange range = NSMakeRange(6, 2);
 73 //        NSString *subStr2 = [str1 substringWithRange:range];
 74 //        NSLog(@"subStr2 = %@", subStr2);
 75 //        //比较两个字符串，相等返回YES，否则返回NO。
 76 //        BOOL bb = [subStr isEqualToString:subStr1];
 77 //        if  (bb)
 78 //            NSLog(@"相等");
 79 //        else
 80 //            NSLog(@"不相等");
 81 //        //查找字符串的range
 82 //        NSRange range1 = [str1 rangeOfString:@"World"];
 83 //        int loc = (int)range1.location;
 84 //        int len = (int)range1.length;
 85 //        NSLog(@"loc = %d, len = %d", loc, len);
 86 //        
 87 //        //把字符串转成整型
 88 //        NSString *str6 = @"123";
 89 //        int b = [str6 intValue];
 90 //        NSLog(@"b = %d", b);
 91 //        //组件分割字符串
 92 //        NSString *str7 = @"hello,huashan,welcome,to,huashankeji";
 93 //        NSArray *arr = [str7 componentsSeparatedByString:@","];
 94 //        NSLog(@"arr[4] = %@", arr[4]);
 95 //        
 96 //        NSString *str8 = [str1 stringByAppendingFormat:@" %@", arr[4]];
 97 //        NSLog(@"str8 = %@", str8);
 98 //        //字符串替换出现的字符串
 99 //        NSString *str9 = [str8 stringByReplacingOccurrencesOfString:@"huashankeji" withString:@"HuaShanKeJi"];
100 //        NSLog(@"str9 = %@", str9);
101 #pragma mark - NSArray
102 //        //数组的创建
103 //        NSArray *arr = [NSArray arrayWithObjects:@"hello", @"world", nil];
104 //        //输出为:hello, 2, 1, hello, world
105 //        NSLog(@"%@, %ld, %ld, %@, %@", [arr objectAtIndex:0], [arr count], [arr indexOfObject:@"world"], [arr firstObject], [arr lastObject]);
106 //        NSArray *arr1 = @[@"hello", @"world"];
107 //        NSLog(@"arr1[0] = %@", arr1[0]);//hello
108 //        NSLog(@"%@", arr1);//打印出每一个元素
109 #pragma mark - NSMutableArray
110 //        //创建出一个动态数组arr2
111 //        NSMutableArray *arr2 = [[NSMutableArray alloc] initWithCapacity:1];
112 //        //添加对象（元素）
113 //        [arr2 addObject:@"hello"];
114 //        [arr2 addObject:@"world"];
115 //        [arr2 insertObject:@"HELLO" atIndex:1];
116 //        
117 //        NSLog(@"%ld", [arr2 indexOfObject:@"world"]);//找到对象的下标2，并打印
118 //        NSLog(@"%ld", [arr2 indexOfObject:@"asdf"]);//对象下标为找到，NSNotFound返回一个9223372036854775807
119 ////        [arr2 removeObject:@"HELLO"];//删除指定对象
120 ////        [arr2 removeObjectAtIndex:1];//删除下标为1的数组元素（对象）
121 ////        [arr2 removeLastObject];//删除最后一个对象
122 //        [arr2 replaceObjectAtIndex:1 withObject:@"song"];//替换下标为1的对象
123 //        NSLog(@"arr2 = %@", arr2);
124 //        
125 //        //数组的三种遍历
126 //        //第一种
127 //        long j = [arr2 count];
128 //        for (int i = 0; i < j; ++i)
129 //        {
130 //            NSLog(@"%@", arr2[i]);
131 //        }
132 //       [arr2 addObjectsFromArray:arr];//把数组arr添加到arr2数组后面
133 //        NSLog(@"%@", arr2);
134 //        //第二种
135 //        [arr2 addObject:[NSNumber numberWithInteger:18]];//添加一个长整型常量到对象arr2中
136 //        for (NSString *str in arr2)
137 //        {
138 //            NSLog(@"str = %@", str);
139 //        }
140 //        //第三种
141 //        //用NSArray的类方法创建一个新数组
142 //        NSArray *arr3 = [NSArray arrayWithObjects:@"1", @"4", @"3", @"2",nil];
143 //        for (id original in arr3)
144 //        {
145 //            NSLog(@"object = %@", original);
146 //        }
147 //        
148 //        //比较单个常量字符，并排序。注：字符串比较只比首位，数字字符串线转化为NSNumber
149 //        NSArray *arr4 = [arr3 sortedArrayUsingSelector:@selector(compare:)];
150 //        for (id result in arr4)
151 //        {
152 //            NSLog(@"result = %@", result);
153 //        }
154 //        
155 //        NSArray *arr5 = [arr3 sortedArrayUsingSelector:NSSelectorFromString(@"compare:")];
156 //        for (id result1 in arr5)
157 //        {
158 //            NSLog(@"result1 = %@", result1);
159 //        }
160         
161 #pragma mark - NSDictionary
162         //字典的两种初始化方式
163         NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:@"132", @"1", @"527", @"2", nil];
164         NSString *str = [dic objectForKey:@"2"];//第一种
165         NSLog(@"%@", str);//527
166         //第二种
167         NSDictionary *dic1 = @{@"1":@"132", @"2":@"527"};
168         NSString *str1 = dic1[@"1"];
169         NSLog(@"%@", str1);//132
170         //取出字典里所有的键值allValues取出所有的值
171         NSArray *arr = [dic allValues];
172         NSLog(@"arr = %@", arr);
173         //从所有的键值中一一找到对象
174         NSDictionary *arr1 = [NSDictionary dictionaryWithObjects:arr forKeys:[dic allKeys]];
175         NSLog(@"arr1 = %@", arr1);
176 #pragma mark - NSMutableDictionary
177         //创造和返回一个空字典
178         NSMutableDictionary *mDic = [NSMutableDictionary dictionary];
179         [mDic setObject:@"song" forKey:@"1"];
180         [mDic setObject:@"lei" forKey:@"2"];
181         [mDic setObject:@"hua" forKey:@"3"];
182         [mDic setObject:@"shan" forKey:@"4"];
183         [mDic removeObjectForKey:@"2"];
184         [mDic removeObjectsForKeys:[NSArray arrayWithObjects:@"1",@"2", nil]];
185         NSLog(@"mDic = %@", mDic);
186         //字典的快速遍历
187         NSArray *arr2 = [mDic allValues];
188         for (id object in arr2)
189         {
190             NSLog(@"object = %@", object);
191         }
192         
193     }
194     return 0;
195 }