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 }
时间： 2024-10-15 19:55:33