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From: Lynn McGuire <lynnmcguire5@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: Suggested method for returning a string from a C program?
Date: Sat, 22 Mar 2025 13:32:41 -0500
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In-Reply-To: <vrd77d$3nvtf$2@dont-email.me>

On 3/18/2025 8:38 PM, DFS wrote:
> 
> I'm doing these algorithm problems at
> https://cses.fi/problemset/list/
> 
> For instance: Weird Algorithm
> https://cses.fi/problemset/task/1068
> 
> My code works fine locally (prints the correct solution to the console), 
> but when I submit the .c file the auto-tester flags it with 'runtime 
> error' and says the output is empty.
> 
> ------------------------------------------------------------
> // If n is even, divide it by two.
> // If n is odd, multiply it by three and add one.
> // Repeat until n is one.
> // n = 3: output is 3 10 5 16 8 4 2 1
> 
> 
> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
> 
> int main(int argc, char *argv[])
> {
>      int n = atoi(argv[1]);
>      int len = 0;
>      char result[10000] = "";
>      sprintf(result, "%d ", n);
> 
>      while(1) {
>          if((n % 2) == 0)
>              {n /= 2;}
>          else
>              {n = (n * 3) + 1;}
> 
>          if(n != 1)
>              {
>                  len = strlen(result);
>                  sprintf(result + len, "%d ", n);
>              }
>          else
>              break;
>      }
> 
>      len = strlen(result);
>      sprintf(result + len, "1 ");
>      printf("%s\n",result);
> 
>      return 0;
> }
> ------------------------------------------------------------
> 
> Any ideas?
> Thanks

strdup.
    https://www.geeksforgeeks.org/strdup-strdndup-functions-c/

Lynn