NSNumber(封装基本数据类型)

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////  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 char * 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;}
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