int?main(void)
{?int?x,i;
double?y;
for(i=1;i<5;i++)
{printf("please?choose:\n1)select?crisps\n2)select?popcorn\n3)select?chocolate\n4)select?cola\n0)exit\n");
scanf("%d",&x);//這裏是%d
printf("%d",x);
if(x?==?0)
break;switch(x)
{
case?1:y=3.0;break;//case?跟1之間要有空格
case?2:y=2.5;break;
case?3:y=4.0;break;
case?4:y=3.5;break;
default:y=0.0;break;
}
printf("價格為%0.1f元",y);
}
printf("謝謝惠顧！");
return?0;}