require 'matrix' class Matrix def to_pretty_s s = "" i = 0 while i < self.column_size s += "\n" if i != 0 j = 0 while j < self.row_size s += ' ' if j != 0 s += self.element(i, j).to_s j += 1 end i += 1 end s end def to_readable m
变量是什么? 变量的作用 Variables are used to store information to be referenced and manipulated in a computer program. They also provide a way of labeling data with a descriptive name, so our programs can be understood more clearly by the reader and ourselves