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Geek Culture / C program question

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DK_
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Posted: 24th Mar 2004 04:00
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I know C++ very well, but then I decided to try and learn a little C since it is compatible with Unix. I tried to write a fairly simple program that will convert the number you enter into Hexadecimal. Here is my code:



Output:
Type in a number to be converted:
7
The value 31 converted to Hex is: 37


Or something like that, the numbers are completely diff. then what they should be.
the last output line should say:
"The value 7 converted to Hex is: 7"

Please let me know what is wrong with my code.

laptop5002@hotmail.com
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TheAbomb12
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Posted: 24th Mar 2004 07:36
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you where using "getc()" which mean get char...

ch is an int not a char.

try this instead.



you might have noticed I used scanf(), it works in a similar manner as printf, except you need a '&' right before the variable.

Amist the Blue Skies...
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Elleomea
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Posted: 24th Mar 2004 11:01
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Alternatively you can convert char to int with atoi() (standard function, think it's in stdlib)

How much ham could a hamster stir, if a hamster could stir ham?
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TheAbomb12
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Posted: 24th Mar 2004 17:59 Edited at: 24th Mar 2004 17:59
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Quote: "atoi() "


I had an annoying experience with this function.

If I remember right, you have to have the variable be a single dimension array with an index size of 1.

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TheAbomb12
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Posted: 24th Mar 2004 18:50 Edited at: 24th Mar 2004 19:20
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I just made an easier function then atoi...



All you need to do is enter to character value of a number. If it is not a number a -1 is returned.

If you need a float value instead of an int, change all the ints into floats.

[edit]crap, I just noticed you can only return a single digit[/edit]

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DK_
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Posted: 25th Mar 2004 01:55
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Thanx that help.

I just noticed something really neat though, C and C++ compilers are the same. If you have a C compiler you have a C++ compiler and vice versa. It just depends on the libraries your compiler comes with, if you have a C compiler and want C++ you don't have to buy another one, all you have to do is download the file "iostream.h" and if you want to go from C++ to C get the file "stdio.h".

I figured this out by having those two files and then running the following program, (which actually works!):



I thought that that was interesting at least.

laptop5002@hotmail.com
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Elleomea
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Posted: 25th Mar 2004 03:16
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C++ compilers can compile C programs, C compilers can't compile C++ prorgams, since C has no support for the object orientated paradigm (that's the whole reason for C++). And err, you never have to buy a C++ compiler, one of the best C++ compilers is G++, the GNU C++ compiler which is Free (as in Freedom and as in beer).

How much ham could a hamster stir, if a hamster could stir ham?
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