math conversions

[MikeJ]

Hello,
Are there any classes that do the conversions from
hex2Dec(), dec2Hex()

decimal, hex, octal ..and back to a Base
or do i have to implement them myself based
on existing conversion utilities in Net

Thanks
MJ

 

[Petar Repac]

1) for hex2Dec()
look at Convert.ToInt32(value, fromBase)
http://msdn2.microsoft.com/en-us/library/1k20k614.aspx

int i = Convert.ToInt32 ("A", 16);
// i is now 10

2) for dec2Hex()
look at Int32.ToString(format)
http://msdn2.microsoft.com/en-us/library/8wch342y.aspx

string s = 10.ToString("X")
// s is now "A"

Regards, Petar Repac

 

[David R. Longnecker]

Mike-

I'm not sure about an actual method for it, but Hex-> Dec, you can use the
Int32.Parse method.

string hexString = "000a01af";
int intOutput = Int32.Parse(hexString, NumberStyles.HexNumber);

NumberStyles is part of the System.Globalization namespace.

For Dec -> Hex, a String.Format should work in most cases (using integer
from above) :

UInt32 unicodeInt = Convert.ToUInt32(intOutput);
string hexOutput = String.Format("{0:x2}", unicodeInt);

Octal and others... I'm not sure, but I'd assume _someone_ has come up with
the libraries or at least has posted the source code somewhere.

HTH.

-dl

--
David R. Longnecker
http://blog.tiredstudent.com

M> Hello,
M> Are there any classes that do the conversions from
M> hex2Dec(), dec2Hex()
M> decimal, hex, octal ..and back to a Base
M> or do i have to implement them myself based
M> on existing conversion utilities in Net
M> Thanks
M> MJ

 

[MikeJ]

Thank you much
MJ

 

[=?ISO-8859-1?Q?Arne_Vajh=F8j?=]

Are there any classes that do the conversions from
hex2Dec(), dec2Hex()

decimal, hex, octal ..and back to a Base
or do i have to implement them myself based
on existing conversion utilities in Net

A very general approach:

private static string DIGITS = "0123456789ABCDEF";
private static int FromAny(string s, int radix)
{
int res = 0;
char[] sa = s.ToCharArray();
for (int i = 0; i < s.Length; i++) {
res = res * radix + DIGITS.IndexOf(sa);
}
return res;
}
private static string ToAny(int i, int radix)
{
string res = "";
int tmp = i;
while (tmp > 0) {
res = DIGITS.ToCharArray()[tmp % radix] + res;
tmp = tmp / radix;
}
return res;
}
public static int FromDec(string s)
{
return FromAny(s, 10);
}
public static string ToDec(int i)
{
return ToAny(i, 10);
}
public static int FromHex(string s)
{
return FromAny(s, 16);
}
public static string ToHex(int i)
{
return ToAny(i, 16);
}
public static int FromBin(string s)
{
return FromAny(s, 2);
}
public static string ToBin(int i)
{
return ToAny(i, 2);
}

Arne