Objective-c：如何舍入Float值？

Question

  

可能重复：
  Rounding numbers in Objective-C

在Objective-c中如何舍入Float值？

Answer 1

除了其他答案：

float theFloat = 1.23456;
int rounded = roundf(theFloat); NSLog(@"%d",rounded);
int roundedUp = ceil(theFloat); NSLog(@"%d",roundedUp);
int roundedDown = floor(theFloat); NSLog(@"%d",roundedDown);
// Note: int can be replaced by float

对于四舍五入到特定小数，请参阅Alex Kazaev提到的问题。

Answer 2

函数lroundf()将执行此操作：

float a=20.49;
int myInt = lroundf(a);

Answer 3

转换为int然后转换回float。

CGFloat *myFloat = 100.765;
NSInteger *myInteger = myFloat;
CGFloat *newFloat = myInteger;

这将有效