c语言程序修改的问题

Question

c语言代码修改的问题 如图所示 //1 //2 //3 //4 //5 //6 //7
怎么去修改

Answer 1

if(head == NULL)
{
  printf("X");
  return;
}
printf("%d",head->data);
while(head->next != NULL)
{
  head= head->next ;
  printf("-> %d",head->data);
}
printf("-> X");