int choice,i;
 double price;
 for(i=1;i<=5;i++){
  //以下5行顯示菜單
  printf("[1]Select crisps\n"); //查詢(xún)薯片價(jià)格
  printf("[2]Select popcorn\n"); //查詢(xún)爆米花價(jià)格
  printf("[3]Select chocolate\n"); //查詢(xún)巧克力價(jià)格
  printf("[4]Select cola\n"); //查詢(xún)可樂(lè)價(jià)格
  printf("[0]exit\n"); //退出查詢(xún)
  printf("Enter choice:");
  scanf("%d",&choice); 
  
  if(choice == 0) //如果輸入為0，則提前結(jié)束循環(huán) 
   break; 
   
  switch(choice){
   case 1:price = 3.0;break;
   case 2:price = 2.5;break;
   case 3:price = 4.0;break;
   case 4:price = 3.0;break;
   default:price = 0.0;break;
  }
  
 printf("price = %0.1f\n",price);
 }
 printf("Thank you\n");
 return 0;