objective-c - 关于NSNumber numberWithDouble

Question

double test1 = 5.58f;

NSString *test2 = @"5.58";

NSLog(@"%@", [NSNumber numberWithDouble:test1]);

NSLog(@"%@", [NSNumber numberWithDouble:[test2 doubleValue]]);

输出:

5.579999923706055

5.58

为什么转换与众不同？

Answer 1

可能由于5.58f是float而不是double的事实。