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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.lang.c
Subject: Re: Suggested method for returning a string from a C program?
Date: Tue, 18 Mar 2025 20:07:08 -0700
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DFS <nospam@dfs.com> writes:

> 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?

Have you thought about how large the value of 'n' can
become inside the while() loop?