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December 7, 2016 11:06
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Float Point Values Computation
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| import UIKit | |
| let a = 1e+30 | |
| let b = -1e+30 | |
| let c = 1.0 | |
| let sum1 = (a + b) + c | |
| let sum2 = a + (b + c) | |
| //Representation of floating point value according to IEEE 754 | |
| let lbits = Double(-0.06) | |
| lbits.sign //sign | |
| lbits.exponent //exponent | |
| lbits.significand //mantissa |
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We all know the Math rule by permutation sum is not changed so
(a + b) + c = a + (b + c), and it seems to be that it is not TRUE in programming.