foundation-NSNumber

//
//  main.m
//  foundation-NSNumber
//
//  Created by apple on 15/7/3.
//  Copyright (c) 2015年 itcast. All rights reserved.
//

#import <Foundation/Foundation.h>

void number(){
    //将int类型包装成一个nsnumber
    NSNumber *number = [NSNumber numberWithInt:10];
    NSMutableArray *arr = [NSMutableArray array];
    //添加数值到数组中
    [arr addObject:number];
    //取出来的还是nsnumber,不会自动拆箱
    NSNumber *num = [arr lastObject];
    //将nsnumber转换成int
    int i = [num intValue];
    NSLog(@"%i",i);
}

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        number();
    }
    return 0;
}