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How can I handle hex input and convert to decimal?

Posted on 2003-03-22
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Last Modified: 2011-08-18
Hi,

I'm writing a program which will prompt the user an offset to be used to dump the contents of a file to hex. The offset is to be entered in hex. For example if they enter f I want to convert it to 15. I'm an old goat trying to learn, so be gentle. Thanks. The following is what I've been trying with no luck.

  unsigned int n;
  char line[10];
     
  printf("enter a hex\n");
 
  fgets(line, 10, stdin);      
  scanf(line,"%d", &n);
 
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3 Comments
 
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Accepted Solution

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gj62 earned 300 total points
ID: 8187739
%x in your scanf will treat the incoming value as hex, and assign it to your int...

scanf(line,"%x", &n);
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by:old_goat_trying_to_learn
ID: 8187887
Thanks gj62,

I had tried that before(sorry for not mentioning it), but it didn't work. It worked once I used sscanf rather than scanf. If I may ask...why?

Thanks
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LVL 6

Expert Comment

by:gj62
ID: 8188887
Sorry, should have seen that to begin with...

scanf reads from stdin (the keyboard, in most cases)

sscanf reads from a string.

So, when you said:

scanf(line,"%x", &n);

it was actually looking in line for the format string...

in

sscanf(line,"%x", &n);

it knew that line was the input buffer.

Functions that have a variable number of args can't do alot of checking, and that's a common bug to have happen...
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