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NNTP-Posting-Date: Thu, 06 Dec 2012 23:37:34 -0600
Message-ID: <50C1809F.508C@mindspring.com>
Date: Fri, 07 Dec 2012 00:37:35 -0500
From: pete <pfiland@mindspring.com>
Reply-To: pfiland@mindspring.com
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Newsgroups: comp.lang.c
Subject: Re: Saving an unsigned short integer to string
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Xref: csiph.com comp.lang.c:29005

Test wrote:
> 
> I need to save ant interger with values ranging from 0-65535
> (0-FFFF) to a string and later retrieve the value.
> 
> For example:
> 
> ..
> int i;
> char mytxt[2];
> 
> i=55;
> ..
> 
> What would be the fastest way
> to save i to mytxt and later retrieve it?
> I am looking from a simple cast if possible.
> I want to avoid using fuction calls.

Get over it and use a function call anyway.

/* BEGIN new.c output */

55
65535

/* END new.c output */




/* BEGIN new.c */

#include <stdio.h>

void utoa(unsigned n, char *s);

int 
main(void)
{
    int i;
    char mytxt[sizeof "65535"];

    puts("/* BEGIN new.c output */\n");    
    i = 55;
    utoa(i, mytxt);
    puts(mytxt);    
    i = 65535;
    utoa(i, mytxt);
    puts(mytxt);
    puts("\n/* END new.c output */");
    return 0;
}

void 
utoa(unsigned n, char *s)
{
     unsigned tenth;
     char *p, swap;
     
     p = s;
     tenth = n;
     do {
         tenth /= 10;
         *p++ = (char)(n - 10 * tenth + '0');
     } while ((n = tenth) != 0);  
     *p-- = '\0';
     while (p > s) {
         swap = *s;
         *s++ = *p;
         *p-- = swap;
     } 
}

/* END new.c */


-- 
pete