Read input from console in Ruby

Question

I want to write a simple A B program in ruby  but I have no idea how to work with the console

User · Answer

you can also pass the parameters through the command line. Command line arguments are stores in the array ARGV. so ARGV[0] is the first number and ARGV[1] the second number

#!/usr/bin/ruby

first_number = ARGV[0].to_i
second_number = ARGV[1].to_i

puts first_number + second_number

and you call it like this

% ./plus.rb 5 6
==> 11

User · Answer

Are you talking about gets   puts  Enter A  a   gets chomp puts  Enter B  b   gets chomp c   a to i   b to i puts c   Something like that   Update  Kernel gets tries to read the params found in ARGV and only asks to console if not ARGV found  To force to read from console even if ARGV is not empty use STDIN gets

User · Answer

if you want to hold the arguments from Terminal  try the following code   A   ARGV 0  to i B   ARGV 1  to i  puts    A      B      A   B

User · Answer

There are many ways to take input from the users  I personally like     using the method gets  When you use gets  it gets the string     that you typed  and that includes the ENTER key that you pressed     to end your input   name   gets  mukesh n       You can see this in irb  type this and you will see the  n  which is the    newline    character that the ENTER key produces     Type name   gets you will see somethings like  mukesh n    You can get rid of pesky newline character using chomp method     The chomp method gives you back the string  but without the terminating newline  Beautiful chomp method life saviour   name   gets chomp  mukesh    You can also use terminal to read the input  ARGV is a constant defined in the Object class  It is an instance of the Array class and has access to all the array methods  Since it   s an array  even though it   s a constant  its elements can be modified and cleared with no trouble  By default  Ruby captures all the command line arguments passed to a Ruby program  split by spaces  when the command-line binary is invoked and stores them as strings in the ARGV array   When written inside your Ruby program  ARGV will take take a command line command that looks like this   test rb hi my name is mukesh   and create an array that looks like this     hi    my    name    is    mukesh     But  if I want to passed limited input then we  can use something like this   test rb 12 23   and use those input like this in your program   a   ARGV 0  b   ARGV 1

User · Answer

If you want to make interactive console      usr bin env ruby  require  readline  addends      while addend string   Readline readline   gt     true    addends  lt  lt  addend string to i   puts    addends join             addends sum   end   Usage  assuming you put above snippet into summator file in current directory    chmod  x summator   summator  gt  1 1   1  gt  2 1   2   3   Use Ctrl   D to exit

[ruby] Read input from console in Ruby?

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