Re: Suggested method for returning a string from a C program?

On 22/03/2025 08:07, Peter 'Shaggy' Haywood wrote:
<snip>

   Here's my solution, for what it's worth:
 #include <stdio.h>
 unsigned long weird(unsigned long n)
{
   printf("%lu", n);
    if(n & 1)
   {
     /* Odd - multiply by 3 & add 1. */
     n = n * 3 + 1;

Or you can save yourself a multiplication
n = (n << 2) - (n - 1);
potentially shaving entire picoseconds off the runtime.

   }
   else
   {
     /* Even - divide by 2. */
     n /= 2;

do
{
   n >>= 1;
} while(~(n & 1));
...and there goes another attosecond.
--
Richard Heathfield
Email: rjh at cpax dot org dot uk
"Usenet is a strange place" - dmr 29 July 1999
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