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* $f_upload->set_size(100); # ÉèÖÃ×î´óÉÏ´«KBÊý
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Floating point precision
It is typical that simple decimal fractions like 0.1
or
0.7
cannot be converted into their internal binary
counterparts without a small loss of precision. This can lead to
confusing
results: for example, floor((0.1+0.7)*10)
will usually
return 7
......
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