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.