Foundation框架-数字对象的操作

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// 数字对象的操作

//-----------------NSNumber--------------/

//实例方法创建数字对象

int number=10;

NSNumber *intNunmber = [NSNumber numberWithInt:number];

NSLog(@"%@",intNunmber);

BOOL isBool = YES;

NSNumber *boolNumber = [NSNumber numberWithBool:isBool];

NSLog(@"%@",boolNumber);

float pi = 3.14;

NSNumber *piNumber =[[NSNumber alloc]initWithFloat:pi];

NSLog(@"%@",piNumber);

char character = 'a';

NSNumber *charNumber=[[NSNumber alloc]initWithChar:character];

NSLog(@"%@",charNumber);

//数字对象的转换

//还原成基本数据类型

int a =[ intNunmber intValue ];

NSLog(@"%i",a);

BOOL b =[ boolNumber boolValue ];

NSLog(@"%d",b);

float p =[ piNumber floatValue ];

NSLog(@"%.2f",p);

char d =[ charNumber charValue ];

NSLog(@"%c",d);

2013-05-0720:21:01.261 Denomo[6572:303]10

2013-05-0720:21:01.263 Denomo[6572:303]1

2013-05-0720:21:01.263 Denomo[6572:303]3.14

2013-05-0720:21:01.264 Denomo[6572:303]97

2013-05-0720:21:01.264 Denomo[6572:303]10

2013-05-0720:21:01.264 Denomo[6572:303]1

2013-05-0720:21:01.265 Denomo[6572:303]3.14

2013-05-0720:21:01.265 Denomo[6572:303]a