Display an integer in hex format

[mcklsn]

Another newbie question: how do you convert an int to a string for printing, but format it in hex rather than decimal?

 

[obislavu]

int iVal ;
string sVal = string.Format("{0,0:X}",iVal);
Example :
string.Format("{0,0:X}",20032003) will return "131AA03" which is 20032003 in hexadecimal.

-obislavu-

 

[mcklsn]

Thank you. This is very helpful. I have 2 follow-up questions, if that's alright. First, I've searched everything I can find about format strings, and I haven't been able to find out the function of the comma between the 2 zeroes. Can you tell me what it does? Second, I would like to print out bytes of data in the form of 2 hex digits always. If the value of the byte is 1, I want it to print out as 01. If it is 0, I want 00. If it is 255, I want FF. I haven't been able to modify the format string so that it always prints out 2 hex digits, even if the leading one is a zero. How do I do that?
Thanks very much for you help. Trying to learn C# by yourself with just books is difficult, and the tips I have been given here are a great help.
Thanks again.

 

[obislavu]

tring s2 = string.Format("{0:00.0}",iVal).TrimEnd('0'); // returns 00., 01., 02. when ival in {1,2,..};

int iVal;
string s3 = string.Format("{0,2:X}",iVal)+".";
// for 0 s3 will be "00."
// for 1 s3 will be "01."
// for 255 s3 will be "FF."

Here is an example to understand the comma in the format e.g. "{0,2:X}"
int a = 9;
int b=99;
int c = a +b;
string s4 = string.Format("The sum of {0,0:00} and {1,0:00} is {2,0:000}",a,b,c);
// s4 ="The sum of 09 and 99 is 109"
The 0,1,2 are associated to the a,b respectively c variable.
0:00, 0:00, 0:000 are associated format for a,b respectively c.

-obislavu-

 

[mcklsn]

This seemed to work for 2 digit hex numbers, but when I wanted to expand it to 8 digits (32 bit words), it supressed leading zeroes again. I fiddled with it some more, but couldn't get anything to work.

 

[obislavu]

I am not sure about exactly what you want but the following statements returns strings in hexa on 8 positions followed by .

int iVal=1;
string s3 = (string.Format("{0,8:X}",iVal)+".&quot.Replace (' ','0');
//s3 will be 00000001.
iVal = 123456789;
string s4 = (string.Format("{0,8:X}",iVal)+".&quot.Replace (' ','0');
//s4 will be 075BCD15.

-obislavu-

 

[mcklsn]

Thanks for your patience. This is exactly what I want. Your help has been envaluable.