Objective-c：如何四舍五入浮点值？

Question

可能重复：
Rounding numbers in Objective-C

在Objective-C如何四舍五入浮点值？

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 

四舍五入至小数点具体，看到亚历克斯Kazaev提到的问题。

Answer 2

功能lroundf()将做到这一点：

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

Answer 3

转换成int，然后转换回浮动。

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

这将工作