How to round float value?

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Steve - 06 Jul 2005 16:06 GMT

I have float value, let say 123.456789. How can I round it to two decimal
digits after decimal point?

For example:

123.456789 -> 123.45

It should be some simple way ...

Thanks

Reply to this Message

Mihajlo Cvetanović - 06 Jul 2005 16:52 GMT

> I have float value, let say 123.456789. How can I round it to two decimal
> digits after decimal point?
>
> For example:
>
> 123.456789 -> 123.45

You should use double, it's more precise:

#include <math.h>
...
double f = 123.456789;
double r1 = floor(f * 100) / 100;
double r2 = floor(f * 100 + 0.5) / 100;

r1 is 123.45, which is 123.456 "floored" to two decimal digits.
r2 is 123.46, which is 123.456 rounded to two decimal digits.

If you really need to work with floats use floorf().

Reply to this Message

Free Magazines

Get these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...