math - Objective c min max operation -

can explain me why code:

nsinteger = -1; nsuinteger x = 1; nslog(@"min = %lu", min(i, x)); nslog(@"max = %lu", max(i, x));; 

prints min = 1

max = 18446744073709551615

you compare 2 different types: signed (nsinteger) , unsigned (nsuinteger). min/max convert unsigned integer.

moreover, negative nsinteger printed %lu instead of %du. therefore see big number.

nsinteger = -1; nsuinteger x = 1; nslog(@"min = %ld", min(i, (nsinteger)x)); nslog(@"max = %ld", max(i, (nsinteger)x));