Note: Difference between Ruby "p" and "puts"

2020/05/17

When I was doing competitive programming with Atcoder Keep a memorandum of the mistakes you made.

Atcoder168_B

OK if the following is displayed in the output

$ ruby Bmain.rb 
4　#input
aaaaa　#input
aaaa... #output

I wrote the following code.


K = gets.to_i
S = gets.chomp

if S.length <= K then
  p S
elsif S.length > K then
  p S[0..(K-1)]+"..."
end

output An error occurs because "" is displayed in the output.

$ ruby Bmain.rb 
4 #input
aaaaa　#input
"aaaa..."　#output

Change p to puts

K = gets.to_i
S = gets.chomp


if S.length <= K then
  puts S
elsif S.length > K then
  puts S[0..(K-1)]+"..."
end

The following was displayed without "".

$ ruby Bmain.rb 
4　#input
aaaaa　#input
aaaa... #output

Since p is for debugging purposes, "" is added for easy understanding.

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