1 //声明一个整数
2 NSInteger a=9;
3 //创建常见的数据类型的对象
4 NSNumber *intNumber=[[NSNumber alloc] initWithInt:5];
5 NSNumber *floatNumber=[[NSNumber alloc] initWithFloat:5.14f];
6 NSNumber *doubleNumber=[[NSNumber alloc] initWithDouble:5.14];
7 NSNumber *charNumber=[[NSNumber alloc] initWithChar:'C'];
8
9 //NSNumber是一个类簇，可以创建各种数据类型的对象
10
11 NSNumber *intNumber=[NSNumber numberWithInt:6];
12 //比较是否相等：不同类型之间也可以相比较
13 BOOL ret=[intNumber isEqualToNumber:intNumber2];
14 BOOL ret=[intNumber isEqualToNumber:floatNumber];
15 //比较大小:
16 if([intNumber compare:intNumber2]==NSOrderedAscending){
17 NSLog(@"<");
18 }else if([intNumber compare:intNumber2]==NSOrderdSame)
19 {
20 NSLog(@"=");
21 }else if([intNumber compare:intNumber2]==NSOrderdDescending){
22 NSLog(@">");
23 }
24 //输出
25 NSLog(@"%d",[intNumber intValue]);
26 NSLog(@"%f",[floatNumber floatValue]);
27 NSLog(@"%f",[doubleNumber doubleValue]);
28 NSLog(@"%c",[charNumber charValue]);
29 //释放
30 [intNumber release];
31 [floatNumber release];
32 [dobuleNumber release];
33 [charNumber release];
