ios Objective-C 浮点舍入
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原文地址: http://stackoverflow.com/questions/4702408/
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Objective-C Float Rounding
提问by CodeGuy
How might I round a float to the nearest integer in Objective-C:
我如何在 Objective-C 中将浮点数四舍五入到最接近的整数：
Example:
例子：
float f = 45.698f;
int rounded = _______;
NSLog(@"the rounded float is %i",rounded);
should print "the rounded float is 46"
应该打印“圆形浮点数为 46”
采纳答案by Dave
The recommended way is in this answer: https://stackoverflow.com/a/4702539/308315
推荐的方法是在这个答案：https: //stackoverflow.com/a/4702539/308315
Original answer:
原答案：
cast it to an int after adding 0.5.
添加 0.5 后将其转换为 int。
So
所以
NSLog (@"the rounded float is %i", (int) (f + 0.5));
Edit: the way you asked for:
编辑：您要求的方式：
int rounded = (f + 0.5);
NSLog (@"the rounded float is %i", rounded);
回答by Jonathan Grynspan
Use the C standard function family round(). roundf()for float, round()for double, and roundl()for long double. You can then cast the result to the integer type of your choice.
使用 C 标准函数族round()。roundf()对于float、round()对于double和roundl()对于long double。然后，您可以将结果转换为您选择的整数类型。
回答by vp2698
For round floatto nearest integer use roundf()
对于舍入float到最接近的整数使用roundf()
roundf(3.2) // 3
roundf(3.6) // 4
You can also use ceil()function for always get upper value from float.
您还可以使用ceil()函数始终从float.
ceil(3.2) // 4
ceil(3.6) // 4
And for lowest value floor()
而对于最低价值 floor()
floorf(3.2) //3
floorf(3.6) //3
回答by capikaw
The easiest way to round a float in objective-c is lroundf:
在objective-c中舍入浮点数的最简单方法是lroundf：
float yourFloat = 3.14;
int roundedFloat = lroundf(yourFloat);
NSLog(@"%d",roundedFloat);
回答by Arvind Kanjariya
If in case you want round float value in integer below is the simple method for rounding the float value in objective C.
如果你想在整数中舍入浮点值，下面是在目标 C 中舍入浮点值的简单方法。
int roundedValue = roundf(Your float value);
回答by NSResponder
Check the manual page for rint()
检查手册页 rint()
回答by Lil C Big Durkee
let's do tried and checkout
让我们尝试并结帐
//Your Number to Round (can be predefined or whatever you need it to be)
float numberToRound = 1.12345;
float min = ([ [[NSString alloc]initWithFormat:@"%.0f",numberToRound] floatValue]);
float max = min + 1;
float maxdif = max - numberToRound;
if (maxdif > .5) {
numberToRound = min;
}else{
numberToRound = max;
}
//numberToRound will now equal it's closest whole number (in this case, it's 1)
