Hex2Dec!!!

[vittal]

Hi All,
Is there any built-in function to convert an Hexadecimal value to Decimal value(Integer,not float)and viceversa. OR is there any easy way of doing it.---- But I want it to work for a wide range of values.

The Exact problem is --- I have an application where the user is asked to type a value and this value is the input to my function. Here I am using an Edit Box to get the input--- and the input to my function must be a hexa value.

--To be precise, If the user types in 20000 in the edit box, and I use GetDlgItemText()function to get the string value and use atol()function to get the integer value. I value I get will be 20000 only and not 20000hexa or not even the decimal value of 20000.

Thanks in Advance...
Vittal

[Matthew.Cross]

To Vittal

Here is some code that might help.

unsigned long CSomeClass::ToDecimal( CString HexNumber )
{
unsigned long Answer = 0, PrevUnit = 1;

HexNumber.MakeReverse();

for( int i=0; i<HexNumber.GetLength(); i++ )
{
switch( HexNumber.GetAt[i] )
{
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9: Answer += (HexNumber.GetAt[i] - '0' * PrevUnit); break;
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f': Answer += ((HexNumber.GetAt[i] - ('a'-10)) * PrevUnit); break;
}
PrevUnit *= 16;
}

return Answer;
}

Matthew Cross

[chiuyan]

use strtol.bool HexToDecimal (char* HexNumber, int& Number)
{
char* pStopString;
Number = strtol (HexNumber, &pStopString, 16);
return (bool)(Number != LONG_MAX);
}

HTH
--michael