decimal acrobats

[Gary Wessle]

Hi

is there a method to trim the number of decimals to a given length.
those numbers are read off a text file, they will need to be atof(ed)
either before or after trimming, whats the right way to do this?
any boost(ers) there?
many thanks

[Victor Bazarov]

Gary Wessle wrote:

is there a method to trim the number of decimals to a given length.

During input or output? For output see 'setprecision' manipulator. For
input, I am not sure of the sensible way of doing that.

those numbers are read off a text file, they will need to be atof(ed)

If you intend to use 'atof' literally, I caution you - it's not a good idea.
Consider using 'strtod' instead.

either before or after trimming, whats the right way to do this?

Use 'strtod', and there is no need to trim during input, AFAIK. Why do you
think you need to trim?

V
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[Gary Wessle]

"Victor Bazarov" <v.********@comAcast.netwrites:

Gary Wessle wrote:

is there a method to trim the number of decimals to a given length.

During input or output? For output see 'setprecision' manipulator. For
input, I am not sure of the sensible way of doing that.

those numbers are read off a text file, they will need to be atof(ed)

If you intend to use 'atof' literally, I caution you - it's not a good idea.
Consider using 'strtod' instead.

either before or after trimming, whats the right way to do this?

Use 'strtod', and there is no need to trim during input, AFAIK. Why do you
think you need to trim?

just for the cout format. from .898900000 to .8989 which strtod works,
but if fails to include 4 in this example (from .89890004 still puts
out .8989)

[Victor Bazarov]

Gary Wessle wrote:

[..]
just for the cout format. from .898900000 to .8989 which strtod works,
but if fails to include 4 in this example (from .89890004 still puts
out .8989)

Post your code and your data, then we can talk. Is it possible that you
are using 'float' where you should be using 'double'?

V
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