int price;
//Scanner in = new Scanner(System.in);
price = in.nextInt();
System.ou.println("100-" + price + "=" + (100-price));
You must difine it before using it.
Scanner是一个类，一个开源代码，为了获取控制台输入。用它创建一个对象（in），System.in可以看做一个参数(系统输入流)，这个参数是键盘输入内容，可以用in.nextLine()方法等待用户输入，如果用String XX来接收就是：String XX=in.nextLine()。
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本文标题：002 unresolved compilation probl
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