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converting string to integer

Posted on 1998-12-16
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Last Modified: 2010-04-04
How do i convert a string to integer which is to large and exceed 2147483647 in delphi 3 ?

Thank you.      
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Question by:n_chai
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7 Comments
 
LVL 4

Expert Comment

by:dwwang
ID: 1351451
Why not convert it to double/extended?

You know, even you can convert it to an "integer", it will result in no use because it cannot participate any calculation with other integers due to exceeding the limit of this type.
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Expert Comment

by:Madshi
ID: 1351452
If you've Delphi4 you can use StrToInt64 and you'll get an 8 byte integer (int64) as a result.

Regards, Madshi.
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Expert Comment

by:binkzz
ID: 1351453
Otherwise just StrToInt(); will do

Bink
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Expert Comment

by:StevenB
ID: 1351454
 ... or StrToIntDef() and avoid having to handle your own exceptions.
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Expert Comment

by:philipleighs
ID: 1351455
4 byte signed integers (D3 Integer type) can't represent numbers greater than 2^31-1, that's why StrToInt fails.
There is no 4 byte unsigned type in D3, it could have been Cardinal or DWORD, but they are both declared as Integer (I think). At least then you could have got to 2^32-1.

As dwwang says, use Extended remembering that they don't represent integers very well.

What's the nature of your app any, and why the big numbers?
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Accepted Solution

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rickpet earned 30 total points
ID: 1351456
You should use a comp type...

In Delphi 3 this is 64bit integer though internally it is a Floating Type.

from Delphi 3 help.
The Comp (computational) type is a 64-bit integer that holds integral values from
-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 (-263 to 263-1).

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Expert Comment

by:slautin
ID: 1351457
You must use 8 or more bytes for storing lage values.
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