如何输入整数值数组，以preceeding行+列的值？红宝石 [英] How to input integer value to an array, based preceeding row + column values? RUBY

问题描述

有关这个项目之后，我应该把输入的格式如下：R1C5 + 2，其内容为在餐桌上，一排5列1，加2或者格式为：R1C2C3-5，这曰：在餐桌上，排1月2日至3日柱，减去5这是假设表中所有数字是最初所有0

For this following project, I am supposed to take input in the following format : R1C5+2 , which reads it as "in the table, Row 1 Column 5 ,add 2. Or in this format : R1C2C3-5 , which reads : "in the table, Row 1 Column 2-3, subtract 5. This is assuming that all numbers in the table are initially all 0.

在哪里我离开的：

我无法找到一个方法来检测一个+或 - 要么在表中加/减值。此外，在提供一系列允许多个补充提供两个C的或R级的时候。例如：R1R5C2C3 + 2（行范围1 - 5，列范围2 - 3，加2）。

I am having trouble finding a way to detect for a "+" or "-" to either add/subtract values in the table. Also, in providing a range to allow multiple additions when provided two C's or R's. For example: R1R5C2C3+2 (Row Range 1 - 5, Column Range 2 - 3, add 2).

下面是下列code：

puts 'Please input: '
x = gets.chomp

col = []
row = []

x.chars.each_slice(2) { |u|  u[0] == "R" ? row << u[1] : col << u[1] }

p col
p row

puts "Largest # in Row array: #{row.max}"
puts "Largest # in Columns array: #{col.max}" #must be in "" to return value

big_row = row.max.to_i
big_col = col.max.to_i


table = Array.new (big_row) { Array.new(big_col) }

我谢谢大家的帮助！

I thank you all for the help!

推荐答案

您正在寻找的方法是 =〜运营商。如果你使用它的一个字符串，并给它一个正规表达式模式，将返回字符串中的模式的位置。因此：

The method you are looking for is the =~ operator. If you use it on a string and give it a regexp pattern it will return the location of that pattern in the string. Thus:

x = 'R1C2C3-5'

x =~ /R/

收益： 0 自认为是'R'字符串中的位置（计就像一个数组0,1,2 ...）

returns: 0 since that is the position of 'R' in the string (counted just like an array 0,1,2...).

如果您不熟悉正则表达式和 =〜运营商，我建议你检查出的Ruby文档就可以了，这是非常有价值的。基本上斜杠的模式得到匹配。您正在寻找匹配 + 或 - ，但它们在正则表达式特殊的意义，所以你有逃避他们反斜杠。

If you are unfamiliar with regexp and the =~ operator, I suggest you check out the Ruby doc on it, it is very valuable. Basically the pattern between the forward slashes get matched. You are looking to match + or -, but they have special meaning in regexp, so you have to escape them with a backslash.

x =~ /\+/
x =~ /\-/

但你可以结合这些成一个模式匹配带或符号（管道） |

x =~ /\+|\-/

所以，现在你有一个方法来获得操作：

So now you have a method to get the operator:

def operator(my_string)
  r = my_string.slice(my_string =~ /\+|\-/)
end

我也将使用运营商的字符串分割成列/行部分和数字部分：

I would also use the operator to split your string into the column/row part and the numeric part:

op = operator(x)    # which returns op = '-'
arr = x.split(my_string(x))  # which returns an array of two strings ['R1C2C3', '5']

我留下进一步字符串操作给你。我将通过对String类此页阅读： Ruby的String类这对数组：红宝石Array类如红宝石包含了如此许多方法，使这样的事情更容易。有一件事情我已经学会使用Ruby做的是想我要做到这一点，我不知道是否已经有一个内置的方法来做到这一点？我去检查的文档。更是让使用Rails！

I leave further string manipulation up to you. I would read through this page on the String class: Ruby String Class and this on arrays: Ruby Array Class as Ruby contains so many methods to make things like this easier. One thing I've learned to do with Ruby is think "I want to do this, I wonder if there is already a built in method to do this?" and I go check the docs. Even more so with Rails!

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