# ascii to hex

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• 04-26-2002
ripper079
ascii to hex
Hi everybody,

I have a single char which I want to look up the hexadecimal value for. I couldn't find a plain ascii_to_hex function so my question is simple.. is there a function somewhere in the headerfiles or do I have to code my own?

example:

i have a single 'A' and want to get the hex value for 'A' -> (41)

Regards
-David-
• 04-26-2002
ripper079
solved.
I managed to solve the problem and here is what I came up with...

Code:

```unsigned long getHexValue(char ch) {   unsigned long ret = 0x0;   /* mask the first 4 bits and shift 4 bits right */   ret = ((ch & 0xF0) >> 4);   /* shift 4 bits left */   ret = (ret << 4);   /* append the last 4 bits */   ret |= (ch & 0x0F);     return ret; }```
If there is someone with a better solution just let me know.

Regards
-David-
• 04-26-2002
ygfperson
as far as i understand (which isn't that far) hex numbers == decimal numbers
an ascii char is a value. you need to put it in a string or something. to print it in hex you could do this:
Code:

```unsigned char value = 56; // any value < 256 will do char let1,let2; let1 = value / 16; let2 = value % 16; if (let1 > 9) let+='A' - 10; else let+='0'; if (let2 > 9) let+='A' - 10; else let+='0'; cout << let1 << let2;```
i'll bet that printf has a way of printing hex without this. i'll almost positive of it. and cout probably can, too.
• 04-26-2002
swoopy
How about?

cout << hex << (int)'A' << endl;
• 04-26-2002
swoopy
Or?

char hex[10];
sprintf(hex,"%X",'A');
cout << hex << endl;