Question

我有两个“ rb”文件： SimpleCal.rb， cli.rb

SimpleCal.rb->代码

class SimpleCal

#adding two numbers
  def addition_function(n1,n2)
      n1 + n2
  end
#subtracting two numbers (Validation:n2 shouldn't be greater than n1)
  def subtract_function(n1,n2)
    if n1<n2
      puts "Error:Negative"
    else
      n1 - n2
    end
  end
#multiplication (Validation:n1 & n2 shouldn't be 0)
  def multiplication_function(n1,n2)
    if n1 == 0 || n2 == 0
      puts "Warning:Result will be zero"
    else
      n1 * n2
    end
  end
#divison (Validation:n2 shouldn't be 0)
  def division_function(n1,n2)
    if n2 == 0
      puts "Warning:Division by zero"
    else
      n1 / n2
    end
  end
end

说明：我正在尝试提供用于简单计算器的方法功能以及验证。

clir.rb->代码（thor）

require 'thor'
require 'SimpleCal'


class MyCLI < Thor
  desc "add", "Addition of two numbers"
  #making use of options to provide values in terminal to add
  option:n1, :type => :numeric
  option:n2, :type => :numeric
  #thor:add command(should call the method "addtion function from SimpleCal.rb" and add the values provided through "options" in terminal)
   def add
     puts "n1: #{options[:n1]}"
     puts "n2: #{options[:n2]}"

     obj = SimpleCal.new

     res = obj.addition_function(options[:n1],options[:n2])

     puts "Addtion ->#{res}"
   end
   def mul
     puts "n1: #{options[:n1]}"
     puts "n2: #{options[:n2]}"

     obj = SimpleCal.new

     res = obj.multiplication_function(options[:n1],options[:n2])

     puts "Multiplication ->#{res}"
   end
   def sub
     puts "n1: #{options[:n1]}"
     puts "n2: #{options[:n2]}"

     obj = SimpleCal.new

     res = obj.subtract_function(options[:n1],options[:n2])

     puts "Subtract ->#{res}"
   end
   def div
     puts "n1: #{options[:n1]}"
     puts "n2: #{options[:n2]}"

     obj = SimpleCal.new

     res = obj.subtract_function(options[:n1],options[:n2])

     puts "Divison ->#{res}"
   end

end

MyCLI.start(ARGV)

说明： cli.rb文件应从SimpleCal.rb文件调用方法函数以执行简单的计算器功能。计算器的值应使用“选项”通过终端传递预期产量：红宝石cli mul --n1 2 --n2 3 n1：2 n2：3 乘法：6

错误：

./cli.rb:15:in `add': undefined method `new' for SimpleCal:Module (NoMethodError)
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/command.rb:27:in `run'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in `invoke_command'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor.rb:387:in `dispatch'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/base.rb:466:in `start'
        from ./cli.rb:54:in `<main>'

感谢您的帮助（我是新手）

Answer 1

错误表明SimpleCal是一个模块，但是您显示的代码将其定义为一个类。

检查（您已经保存了SimpleCal.rb文件）并指向您认为是文件的副本。

Ruby：使用THOR在终端提供值的简单计算器。错误：`add'：未初始化的常量MyCLI :: Simplecal（NameError）

1 个答案: