decimal place rounding off

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Lucy Hannah
Lucy Hannah 2019-5-2
编辑： Stephen23 2019-5-2
how to round of a number into 2 decimals places without using the round function?

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回答（1 个）

Rik
Rik 2019-5-2
Why not use the round function?
You could use floor, ceil, or fix instead, but that would be cheating a bit.
Anyway, you can use the code below:
rounded_value=str2double(sprintf('%.2f',value));
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Adam
Adam 2019-5-2
floor( 3.1425 * 100 ) / 100
works fine for me. But then I would always just use the round function anyway since that is precisely what it is there for!
Stephen23
Stephen23 2019-5-2
编辑：Stephen23 2019-5-2
"...if i use floor(a*100)/100 it will become 3.1400"
How numbers are displayed is controlled by the format command, where the default setting is short. You can change the format setting and you might get what you want:
>> format short g
>> floor(3.1425*100)/100
ans = 3.14
It is also important to note that this numeric value does not actually exist: what you see displayed is only an approximation of the binary floating point number that is actually stored in memory. Remember, how data is displayed is a totally different thing to how it is stored in memory!

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