Objective-c：如何四捨五入浮點值？

Question

可能重複：
Rounding numbers in Objective-C

在Objective-C如何四捨五入浮點值？

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 

四捨五入至小數點具體，看到亞歷克斯Kazaev提到的問題。

Answer 2

功能lroundf()將做到這一點：

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

Answer 3

轉換成int，然後轉換回浮動。

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

這將工作