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splitting digit hex codes into 2 chars

Posted on 2004-09-21
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Last Modified: 2010-04-15
Hi i am trying to convert the two digit hex value of unprintable chars into two seperate chars, then i can print them as part of a normal C-String

I Have tried

char char1, char2;
int x1 0x01;

char1 = (x1/16)+'0';
char2 = (x1%16)+'0';

printf("%c %c", char1, char2);

Ok where am I going wrong. Please help
 
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Comment
Question by:dublinsoft
8 Comments
 
LVL 5

Accepted Solution

by:
tzxie2000 earned 43 total points
ID: 12116950
as hex is 0-9,A-F

so  if the high part of x1 is bigger then 9 like int x1 0xA1 you will get error output

so you should check it
for example

if(x1/16<10)
char1 = (x1/16)+'0';
else
char1 = (x1/16-10)+'A';
0
 
LVL 86

Expert Comment

by:jkr
ID: 12117007
What about

int x1=0x01;

printf("%2.2x", x1);

?
0
 
LVL 86

Assisted Solution

by:jkr
jkr earned 41 total points
ID: 12117017
Or

char ac[2]
int x1=0x01;

snprintf(ac,2,"%2.2x", x1);

?

0
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LVL 55

Expert Comment

by:Jaime Olivares
ID: 12117021
you can use standard itoa() function:

char hex[3];
int x1 = 0x01;  /* there is a missing = sign in your example */

itoa (x1, hex, 16);

/* now your digits are hex[0] and hex[1] */
printf("%c %c", hex[0], hex[1]);

0
 

Expert Comment

by:aakash_mandhar
ID: 12121202

void main()
{
int n=0xAB;
char sol[2];
sprintf(sol,"%x",n);
printf("%c and %c are the 2 digits",sol[0],sol[1]);
}

PS> Hope this helps

Regards
Aakash
0
 
LVL 55

Assisted Solution

by:Jaime Olivares
Jaime Olivares earned 41 total points
ID: 12122609
Just noticed mine and aakash won't work with 1 digit values. Must be:

void main()
{
int n=0x1;
char sol[3];                   // Buffer must have 3 bytes, for trailing null character
sprintf(sol,"%02X",n);    // Notice the %02X format, will ensure a leading 0 if number has 1 digit only.
printf("%c and %c are the 2 digits",sol[0],sol[1]);
}
0

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