ios - Why do brackets mess up this math in objective-c? -

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why 2 calculations have differing results? xcode 6.1.

(lldb) print newbounds.size.height (cgfloat) $0 = 446.5 (lldb) print newbounds.size.height * 6/4 (double) $1 = 669.75 (lldb) print newbounds.size.height * (6/4) (double) $2 = 446.5

it's integer math , usual rules promotion of types.

height * 6/4 == (height * (double)6) / (double)4 == (height * 6.0) / 4.0

whereas:

height * (6/4) == height * (double)(1) == height * 1.0

since 6/4 == 1 , parentheses force evaluated first before promoting double.

this same behaviour in c, c++, objective-c, et al, shouldn't surprised see in debugger too.


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