NSNumber的各种使用法

Creating an NSNumber Object

• + numberWithBool:
• + numberWithChar:
• + numberWithDouble:
• + numberWithFloat:
• + numberWithInt:
• + numberWithInteger:
• + numberWithLong:
• + numberWithLongLong:
• + numberWithShort:
• + numberWithUnsignedChar:
• + numberWithUnsignedInt:
• + numberWithUnsignedInteger:
• + numberWithUnsignedLong:
• + numberWithUnsignedLongLong:
• + numberWithUnsignedShort:

1.定义基本数据类型

        char a = 'c';

        int b = 105;

        short c = 20;

        long d = 50;

        float e = 3.33;

        double f = 4.4499;

        BOOL isTure = YES;

2.将基本数据类型转换为NSNumber

        NSNumber *a1 = [NSNumbernumberWithChar:a];

        NSNumber *b1 = [NSNumbernumberWithInt:b];

        NSNumber *c1 = [NSNumbernumberWithShort:c];

        NSNumber *d1 = [NSNumbernumberWithLong:d];

        NSNumber *e1 = [NSNumbernumberWithFloat:e];

        NSNumber *f1 = [NSNumbernumberWithDouble:f];

        NSNumber *isTure1 = [NSNumbernumberWithBool:isTure];

        NSArray *arr = [NSArrayarrayWithObjects:a1,b1,c1,d1,e1,f1,isTure1, nil];

        NSLog(@"%@", arr);

3.将NSNumber类型对象转换为基本数据类型.

        char a2 = [a1charValue];

        NSLog(@"%c", a2);

        int b2 = [b1intValue];

        NSLog(@"%d", b2);

        

4.NSNumber类型的比较

        NSLog(@"%ld", [a1compare:b1]);