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format double

Posted on 2006-06-27
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Last Modified: 2010-04-24
currently im converting a Standard::String to a double - this is the code im using

retArray[i] = System::Convert::ToDouble(strArray[i]);

as you can see, i have two arrays, one of doubles, the other of strings.

now it goes fine -  except for example i have a string value of "0.70", after the conversion the value in the double array is 0.699999999

shouldnt be that big of a deal, but im doing a number of iterations after that value is obtained, and i want it to be exact.

any idea how to get the value in after its passed to be 0.700000000????

thanks in advance

~b
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Question by:bramsquad
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LVL 30

Assisted Solution

by:Axter
Axter earned 62 total points
ID: 16997168
Hi bramsquad,
> any idea how to get the value in after its passed to be 0.700000000????
A double is not an exact number.
If you need higher precission, you need to use a different type.

Cheers!
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LVL 8

Author Comment

by:bramsquad
ID: 16997352
thanks axter,

different type like what?

~b
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LVL 15

Accepted Solution

by:
lakshman_ce earned 63 total points
ID: 16998026
Try to get the object's value using

Object* defaultValue== __box( Convert::ToDouble( strArray[i]) );

check value here

retArray[i] = *dynamic_cast<__box Double*>(obj);

Also you can use the IFormatProvider class to change the formatting.
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