CODEWITHSUNDEEP
rubyuser-input
Andrelton
Andrelton

Reputation: 150

In Ruby, how can I print my next prompt on the same line after user input?

I'm tinkering with a basic Tower of Hanoi game, and trying to get user input twice, but print both prompts on the same line (separated by the first input). I've searched for awhile, maybe I'm using the wrong terms. I assume the new line is due to gets, or setting it to a variable, but how do I get rid of it? Thanks!

print "Move FROM which tower? (1 / 2 / 3) "
answer1 = gets.chomp.to_i
print "...TO which tower? (1 / 2 / 3) "
answer2 = gets.chomp.to_i

I want this:

Move FROM which tower? (1 / 2 / 3) 1 ...TO which tower? (1 / 2 / 3) 2

But I'm getting this:

*Move FROM which tower? (1 / 2 / 3) 1

...TO which tower? (1 / 2 / 3) 2

(input in bold)

Upvotes: 2

Views: 2889

Answers (3)

Arup Rakshit
Arup Rakshit

Reputation: 118261

Here is some other tricks using ANSI escape sequences

print "From Number "
num1 = gets.chomp.to_i
print "\033[1A\033[14C...TO Number "
num2 = gets.chomp.to_i

output

[arup@Ruby]$ ruby a.rb
From Number 1  ...TO Number 2
[arup@Ruby]$

  • Move the cursor up N lines: \033[NA

  • Move the cursor forward N columns: \033[NC

Values of N you must need to be calculated as per the need. Cursor Movement.

Upvotes: 1

peter
peter

Reputation: 42182

In windows this does the thing

require "Win32API"

def read_char
  Win32API.new("crtdll", "_getch", [], "L").Call
end

print "Move FROM which tower? (1 / 2 / 3) "
print answer1 = read_char.chr
print "...TO which tower? (1 / 2 / 3) "
puts answer2 = read_char.chr

puts answer1+answer2

gives

#Move FROM which tower? (1 / 2 / 3) 1...TO which tower? (1 / 2 / 3) 2
#12

Upvotes: 1

Leo Correa
Leo Correa

Reputation: 19789

The reason you get a new line even after chomp is because in the terminal you've already entered the carriage return key which displays the new line.

What you want can be done like this:

require "io/console"
print "Move FROM which tower? (1 / 2 / 3) "
x = STDIN.getch.to_i
print x
print "...TO which tower? (1 / 2 / 3) "
y = STDIN.getch.to_i
print "#{y}\n"
print "Result: (#{x}, #{y})"

Note this will give an output of this: 

$ ruby tower.rb
Move FROM which tower? (1 / 2 / 3) 1...TO which tower? (1 / 2 / 3) 2
Result: (1, 2)

Note this only gets one character from STDIN.

Upvotes: 3

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