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 Converting a number to a string
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kepler
Junior WebHelper
Junior WebHelper


Joined: 08 Feb 2002
Posts: 37

PostPosted: Thu Oct 07, 2004 3:07 pm (13 years, 2 months ago) Reply with QuoteBack to Top

Hi,

Does anyone knows, in C, what function must we use to convert a number to a string?

Regards,

Kepler
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adam
Forum Moderator & Developer



Joined: 26 Jul 2002
Posts: 704
Location: UK

PostPosted: Thu Oct 07, 2004 3:46 pm (13 years, 2 months ago) Reply with QuoteBack to Top

I don't think there is one in the standard library, but this example from the C book will do it:
Code:
#include <string.h>

void reverse(char s[])
{
   int c,i,j;

   for(i=0, j = strlen(s)-1; i < j; i++, j--) {
      c = s[i];
      s[i] = s[j];
      s[j] = c;
   }
}

void itoa(int n, char s[])
{
   int i, sign;

   if ((sign = n) < 0)   /* record sign */
      n = -n;          /* make n positive */
   i = 0;
   do {    /* generate digits in reverse order */
      s[i++] = n % 10 + '0';   /* get next digit */
   } while ((n /= 10) > 0);
   if (sign < 0)
      s[i++] = '-';
   s[i] = '\0';
   reverse(s);
}


Just call atoi with the number and the char array you want it stored in. If it doesn't compile, it's probably because I typed it wrong Wink

________________________________
It's turtles all the way down...
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