반복문

반복문이 없다면

Python

print("Hello world 0")
print("Hello world 9")
print("Hello world 18")
print("Hello world 27")
print("Hello world 36")
print("Hello world 45")
print("Hello world 54")
print("Hello world 63")
print("Hello world 72")
print("Hello world 81")

Ruby

puts("Hello world 0")
puts("Hello world 9")
puts("Hello world 18")
puts("Hello world 27")
puts("Hello world 36")
puts("Hello world 45")
puts("Hello world 54")
puts("Hello world 63")
puts("Hello world 72")
puts("Hello world 81")

실행결과

Hello world 0
Hello world 9
Hello world 18
Hello world 27
Hello world 36
Hello world 45
Hello world 54
Hello world 63
Hello world 72
Hello world 81

Python | Ruby 

while

Python

while False:
    print('Hello world')
print('After while')

Ruby

while false do
  puts('Hello world')
end
puts('after while')

실행결과 

after while

Python | Ruby

반복조건

Python

i = 0
while i < 3:
    print('Hello world')
    i = i + 1

Ruby

i = 0
while i < 3 do
    puts('Hello world')
    i = i + 1
end

실행결과

Hello world
Hello world
Hello world

Python | Ruby 

 활용

 Python

i = 0
while i < 10:
    print('print("Hello world '+str(i*9)+'")')
    i = i + 1

Ruby

i = 0
while i < 10 do
    puts('puts("Hello world '+(i*9).to_s()+'")')
    i = i + 1
end

실행결과

print("Hello world 0")
print("Hello world 9")
print("Hello world 18")
print("Hello world 27")
print("Hello world 36")
print("Hello world 45")
print("Hello world 54")
print("Hello world 63")
print("Hello world 72")
print("Hello world 81")

Python | Ruby

조건문과 반복문의 합체

 Python

i = 0
while i < 10:
    if i == 4:
        print(i)
    i = i + 1

Ruby

i = 0
while i < 10 do
  if i == 4
    puts(i)
  end
  i = i + 1
end

실행결과

4

Python | Ruby

Python

i = 0
while i < 10:
    if i == 4:
        break
    print(i)
    i = i + 1
print('after while')

Ruby

i = 0
while i < 10 do
    if i == 4
        break
    end
    puts(i)
    i = i + 1
end
print('after while')

실행결과 

0
1
2
3
after while

Python | Ruby

참고

github