Mine

#include<stdio.h>
#include<stdlib.h>



int twirl_state = 0;
void print_twirl()
{
  if (twirl_state==0)
  {
    printf("|\r");
  } else if (twirl_state==1)
  {
    printf("/\r");
  } else if (twirl_state==2)
  {
    printf("-\r");
  } else
  {
    printf("\\\r");
  }

  if (++twirl_state>3)
  {
    twirl_state = 0;
  }
  fflush(stdout);
}

int main(void) {
  for (;;)
  {
    sleep(1);
    print_twirl();
  }
  return 0;
}