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【Ruby】標準入力から値を受け取る

Last updated at Posted at 2022-10-29

数値

入力値
7
i = gets.to_i
p i * 10
結果
70

文字列

入力値
AAA
s = gets.chomp
p s
結果
"AAA"

1行に複数の入力(半角スペース区切り)

入力値
50 100 200

配列で返す場合

arr = gets.split.map(&:to_i)
p arr
結果
[50, 100, 200]

変数に格納する場合

n1, n2, n3 = gets.split.map(&:to_i)
p n1
p n2
p n3
結果
50
100
200

文字列の場合、.map(&:to_i)が不要

複数行の入力

数値

入力値
5000
3

配列で返す場合

lines = 2.times.map { gets.to_i }
p lines
lines = readlines.map(&:to_i)
p lines
結果
[5000, 3]

変数に格納する場合

n1, n2 = 2.times.map { gets.to_i }
p n1
p n2
n1, n2 = readlines.map(&:to_i)
p n1
p n2
結果
5000
3

文字列

入力値
Ruby
Python
Java

配列で返す場合

lines = 3.times.map { gets.chomp }
p lines
lines = readlines.map(&:chomp)
p lines
結果
["Ruby", "Python", "Java"]

変数に格納する場合

s1, s2, s3 = 3.times.map { gets.chomp }
p s1
p s2
p s3
s1, s2, s3 = readlines.map(&:chomp)
p s1
p s2
p s3
結果
"Ruby"
"Python"
"Java"

1行に複数(半角スペース区切り) & 複数行

数値

入力値
1 2 3
4 5 6
m_arr = readlines.map { |i| i.split.map(&:to_i) }
p m_arr
結果
[[1, 2, 3], [4, 5, 6]]

多次元配列を一次元配列にする場合

arr = m_arr.flatten
p arr
結果
[1, 2, 3, 4, 5, 6]

変数に格納する場合

n1, n2, n3, n4, n5, n6 = readlines.map(&:split).flatten
p n1
p n2
p n3
p n4
p n5
p n6
結果
1
2
3
4
5
6

文字列

入力値
a b c
d e f
m_arr = 2.times.map { gets.split }
p m_arr
m_arr = readlines.map(&:split)
p m_arr
結果
[["a", "b", "c"], ["d", "e", "f"]]

多次元配列を一次元配列にする場合

arr = m_arr.flatten
p arr
結果
["a", "b", "c", "d", "e", "f"]

変数に格納する場合

s1, s2, s3, s4, s5, s6 = readlines.map(&:split).flatten
puts s1
puts s2
puts s3
puts s4
puts s5
puts s6
結果
a
b
c
d
e
f

おまけ

入力値
a b
c d
e f
m_arr = readlines.map(&:split)

puts 'arr[0]'
puts '------'
m_arr.each { |arr| p arr[0] }
puts ''

puts 'arr[1]'
puts '------'
m_arr.each { |arr| p arr[1] }
結果
arr[0]
------
"a"
"c"
"e"

arr[1]
------
"b"
"d"
"f"

その他(知っておくと役立つメソッド)

※ 競プロ系の学習をしているので、ついでに役立ちそうなメソッドをメモ書きしています

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