From: bothersome AT mindspring DOT com (Kenneth Lantrip)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Couple of Routine Questions
Date: Thu, 26 Oct 2000 05:45:16 GMT
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To: djgpp AT delorie DOT com
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On Wed, 25 Oct 2000 21:13:13 GMT, bothersome AT mindspring DOT com (Nunya Bidny) wrote:

>
>Hi, I've started working on a small project that I want to do in C just to help
>me learn the constructs of the language.  I'm in need of a couple of basic
>building blocks to use in the rest of the program.  Here is what I need:

>I know there probably is an easy solution.  I'm going to hit the books tonight
>to try to build my own routing, but I thought the good folks of the internet
>could probably build me a much more elegant looking one.  This (full) project
>will probably be placed onto the internet for other people to see and study.
>Just for it's teaching qualities.

>This is not a home-work project...  I'm 35 and just dabbling in this language.

>My email address is correct... so if you don't want everyone to see your code
>you can email if you want.  But, I thought we were all here to learn.

Looks kinda funny to reply to my own message but...  here goes :)

OK this is what I've come up with so far:

#include <stdio.h>

main(void) {

    int x;
    static unsigned char y[33];

    x = 42;
    printf(" %s ", Int2Bin(x, &y));
		/* someone tell my why that worked!!! */

    strcpy(y, "1011101011");

    printf(" %d \n", Bin2Int(y)); 

}

int Int2Bin(int x, char *y) {
    int i;  
    
    y += 32; *y-- = 0;
    for (i = 0; i < 32; i++) {
        *y-- = 48 + (x & 1);
        x >>= 1;
    }
}

int Bin2Int(char *x) {
    int i;

    i = 0; 
    do {
        i <<= 1;
        i += 1 & (*x++ == 49);
    } while (*x != 0);
    return i;
}

I've discovered it would make other stuff a lot easier if all my returned 1's
and 0's were all the same length (like 32 of em).