Command.cpp

void command() {

SELECT_COMMAND:
  int ret = select_command("どうする？");
  switch (ret) {
  case SEL_ATTACK:
    goto SELECT_ATTACK_TYPE;
  case SEL_ESCAPE:
    goto ESCAPE;
  case SEL_CANCEL:
    goto EXIT;
  }
  
SELEC_ATTACK_TYPE:
  ret = select_attack("攻撃タイプは？");
  switch {
  case SEL_ATTACK:
    goto ATTACK_NORMAL;
  case SEL_MAGIC:
    goto ATTACK_MAGIC;
  case SEL_CANCEL:
    goto SELECT_COMMAND;
  }

ESCAPE:
  do_escape("にげだした");
  goto EXIT;

ATTACK_NORMAL:
  do_attack("通常こうげき！");
  goto EXIT;

ATTACK_MAGIC:
  do_magic("魔法でこうげき！");
  goto EXIT;

EXIT:
  return OK;
}