//        //  main.m        //  OC05-task-04        //        //  Created by Xin the Great on 15-1-26.        //  Copyright (c) 2015年 Xin the Great . All rights reserved.        //                #import <Foundation/Foundation.h>                int main(int argc, const charchar * argv[]) {            @autoreleasepool {                // insert code here...                                //////////////////////NSNumber//////////////////////                //封装基本数据类型                                int intValue = 100;                float floatValue = 3.14;                BOOL boolValue = YES;                                NSNumber *intNumber = [[NSNumber alloc] initWithInt:intValue];                NSLog(@"intNumber is %@", intNumber);                NSNumber *floatNumber = [NSNumber numberWithFloat:floatValue];                NSLog(@"floatNumber is %@", floatNumber);                NSNumber *boolNumber = [NSNumber numberWithBool:boolValue];                NSLog(@"boolNumber is %@", boolNumber);                        //包装之后就可以放到容器中                NSArray *arr = @[intNumber, floatNumber, boolNumber];                NSLog(@"arr is %@", arr);                                                //还原成基本数据类型                float value = [floatNumber floatValue];                int value2 = [intNumber intValue];                NSLog(@"value is %.2f",value);                NSLog(@"value2 is %d",value2);                                                //快速创建的方法                NSNumber *intNum = @80;//---->  NSNumber *intNumber = [[NSNumber alloc] initWithInt:80];                                NSNumber *floatNum = @3.14;// ---->[NSNumber numberWithFloat:3.14];                        NSNumber *boolNum = @YES;// ---> [NSNumber numberWithBool:YES];                                NSNumber *charNum = @'a'; // ---> [NSNumber numberWithChar:'a'];                                                //运算                NSNumber *number = @(1 + 2);                                //直接在数组中写                NSArray *arr1 = @[@"string", @12, intNum, floatNum, boolNum, charNum, number];                NSLog(@"arr1 is %@", arr1);                            }            return 0;        }