How to round an float value and convert it into NSInteger value in the iPhone SDK?

I need to round a float value and convert it into an NSInteger value.

For example:

float f = 90.909088;

I want the 开发者_如何学运维result to be 91. How to get rid of this?

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A quick round and cast will work for negative values as well as positives:

NSInteger intValue = (NSInteger) roundf(f);

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One of the following C math functions might work for you:

• double ceil(double)
• double floor(double)
• double nearbyint(double)
• double rint(double)
• double round(double)
• long int lrint(double)
• long int lround(double)
• long long int llrint(double)
• long long int llround(double)
• double trunc(double)

To get more documentation, open a terminal session and type (for example)

man lround

I pick lround as an example because I think that is the one you want.

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Do

f = floor(f + 0.5)

before the integer conversion.

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Try:

float f = 90.909088;
NSNumber *myNumber = [NSNumber numberWithDouble:(f+0.5)];
NSInteger myInt = [myNumber intValue];