Author: Daniel Wischnewski

I have seen quite a few articles on how to convert a decimal number to 
hexa-decimal, yet none have used the most obviuos function. Delphi offers the 
solution already!

Answer:

The solution is quite simple. 

If you have an Integer intX and you want to convert it into an hexadecimal number 
use IntToHex(intNumber, intDigits) 

Expample 1: 
1   
2   strHex = IntToHex(intX, 2);


Delphi will create a hexadecimal string representing intX with at least two digits. 
Therefore if intX is 10, strHex will Hold 0A. 

To convert back to decimal you can use either StrToInt or StrToIntDef. However, you 
must ensure that the string contains a leading dollar-sign ($). 

Example 2.1 (Completting this article using Example 1): 
3   
4   intX = StrToInt('$' + strHex);


Delphi will take strHex (0A), you may have to provide the leading $ and will return 
the Decimal Value 10. 

Example 2.2 (Completting this article using Example 1): 
5   
6   intX = StrToIntDef('$' + strHex, -1);


Delphi will take strHex (0A), you may have to provide the leading $ and will return the Decimal Value 10. If the function fails, it will return the pre-defined value -1.