如何接收"A1"样式的行+列规范作为输入? [英] How do I take in "A1"-style row+column specifications as input?

问题描述

我正在用C ++编写一个TicTacToe游戏.我正在使用2D角色数组将每个玩家的棋子输入一个正方形.但是，对于输入，我要求用户输入A1，它将是board [0] [0]和游戏板的左上角.如何允许用户输入A1，但仍然允许它不使用硬编码就成为board [0] [0]?另外，用户可以确定板子的尺寸.最小:3x3，最大:13x16.

I am writing a TicTacToe game in C++. I am using a 2D character array to input each player's piece into a square. However, for input I am asking the user to type in A1, which will be board[0][0] and the top left corner of the game board. How do I allow the user to type in A1 but still allow that to be board[0][0] without hard coding? Also, the user can determine the board size. Min: 3x3, max: 13x16.

推荐答案

_{(假设板子是3x3，或最多9x9)}

从用户那里获得两个字符，确保第一个是大写字母，第二个是数字，并且它们在正确的范围内.

Get two characters from the user, ensure the first is an uppercase letter and the second is a digit, and that they're in the right range.

请注意-在大多数平台上，您可能正在使用-如果字符变量c的值为'A'，'B'或'C'，则表达式c - 'A'的值为0，1或2，您可以将其用作索引.但是，正如@SomeProgrammerDude指出的那样，它不是100％可移植的代码.

Note that - on most platforms you are likely to be working on - if the character variable c has value 'A', 'B' or 'C' then the expression c - 'A' has value 0, 1 or 2, which you can use as an index. It's not 100% portable code, though, as @SomeProgrammerDude notes.

...如果板子较大，则可能必须允许列和行的多字符规范，并对其进行适当的解析.当然，c - 'A'索引最多只能使用'Z'.

... if the board is larger you may have to allow for multiple-character specification of column and row, and parse them appropriately. The c - 'A' indexing will only work up to 'Z' of course.

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