Is there a function or an algorithm to round up float numbers to 2 digits after the radix point (comma).
Example: 3.1457 ->Rounds up to-> 3.14
Is there a function or an algorithm to round up float numbers to 2 digits after the radix point (comma).
Example: 3.1457 ->Rounds up to-> 3.14
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If it's for display purposes, look up std::setprecision. Otherwise, add .005 or however it would work mathematically.
If you need the mathematical result (rather than display purposes) use std::ceil(value*100.0)/100.0
There are some limits on the range of values this works for (and this assumes a positive value) but, if you are asking the question, you are unlikely to be working outside the relevant range.
Last edited by grumpy; 06-12-2011 at 06:25 AM.
Works without these limits.Code:double round_floating_2(double x) { return x - std::fmod(x, 0.01); }
Btw, it is rounding down, isn't it? My code was provided to work with the example.Originally Posted by godly 20
Yes, it's rounding down.
"A Computer in every desk and in every home, running Microsoft software."
