Snail—OC学习之NSNumber

在以后的学习或者以后做项目的时候 会希望把基本数据类型,例如:int、float等等数值 也存到数组或者字典中

因为数组、字典只能存储对象

所以，NSNumber类可以对基本数据进行封装成一个对象 进行存储

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

    @autoreleasepool {

        NSNumber * intNumber = [NSNumber numberWithInt:11];
        NSNumber * floatNumber = [NSNumber numberWithFloat:2.1f];
        NSNumber * doubleNumber = [NSNumber numberWithFloat:2.2];
        NSNumber * charNumber = [NSNumber numberWithChar:'r'];
        NSNumber * boolNumber = [NSNumber numberWithBool:YES];

        //得到intNumber中得值
        int a = [intNumber intValue];
        NSInteger aa = [intNumber integerValue];

        //把他们放在数组中
        NSArray * array = @[intNumber,floatNumber,doubleNumber,charNumber,boolNumber];
        //把他们放在字典中
        NSDictionary * dict = @{@"int":intNumber,@"float":floatNumber,@"double":doubleNumber,@"char":charNumber,@"bool":boolNumber};

    }
    return 0;
}

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