sprintf and minus sign problem

2015 11 2
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更新时间：2015 11 2
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I have a problem understanding the sprintf function in a specific case:
sprintf('%.2f', 0)
produces: "0.00" , as expected.
In my case I have a variable [value] that should equal 0:
value == 0
ans = 1
but
sprintf(%.2f, value)
results in "-0.00" (a minus sign is added)
Is there any chance that [value] still contains something different from 0, eventhough value == 0 retuns TRUE?

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