Different type of loops

# print from 1 to 50 (inclusive) using loops

# 1. while loop
i = 1
while i < 51
  print i
  i+=1
end

# 2. using until keyword
i = 1
until i == 51 do
  print i
  i+=1
end

# 3. for loop with dots
# 2 dots indicate to include the highest no. in the range. 3 dots mean go up to but DON'T include the highest no.
for i in 1..50
  print i
  i+=1
end