How to represent infinity in objective C?

问题

Is there a way to represent infinity (as a float/double, or NSNumber, etc.) in objective C? In other words, is there a float/double/NSNumber value that is always larger than any other value in objective C?

回答1:

There's a macro for this INFINITY,

float x = INFINITY;

You can find this in usr/include/math.h

#   define    HUGE_VALF    __builtin_huge_valf()
...
#define INFINITY    HUGE_VALF

Edit Some more interesting read here

http://www.gnu.org/software/libc/manual/html_node/Infinity-and-NaN.html

来源：https://stackoverflow.com/questions/30544334/how-to-represent-infinity-in-objective-c