math - PHP (int) / braces mathematically wrong - Possible Bug? -

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this question has answer here:

me , colleges discussing following problem, , although came theories still seeing odd...

<?php  echo (int) ((0.1 + 0.7) * 10);  ?>

outputs 7

whilst

<?php  echo (int) (0.1 + 0.7) * 10;  ?>

outputs 8 (as expected , output if calculator)

could (int) causing issue here? have idea?

thanks lot , day!

the cast integer (and related rounding error) occurs @ different point in formula

calculate 0.1 plus 0.7, multiply 10 , cast integer;

with expected rounding error, should result in 7

against

calculate 0.1 plus 0.7, cast integer, , multiply 10

casting 0.1 + 0.7 (ie 0.8) integer should give 0, multiplied 10 still 0


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