Problem with = and ==

Question

I'm writing a program and I'm having problems with these:

if c = 'binary' then
while a >= 1 do
b = b + String(a % 2)
a = a / 2
end
b.reverse
puts b

This outputs the correct answer, but displays this error:

..\Playground\:5: warning: found = in conditional, should be ==

When I fix this and replace = with == I get no error, but no output either..

What's the problem here? :/

Answer 1

Rewrite that if statement.

if c == 'binary'

And, considering this is Ruby, then your while loop shouldn't have a do at the end of it.

Answer 2

Not with Ruby, no. The then hasn't been in any languages (and as far as I know, QBASIC64 was the last major language to use it.)

Answer 3

You have one more problem. You have an end for your while loop, but not your if statement.

Answer 4

It has no then?

Answer 5

I did as you said, but I still get no output...

Answer 6

I'm learning in school to work with Delphi, and I'm pretty sure it does have then...

Answer 7

I have an end, but that's later in code

Answer 8

Heres the whole code
x = gets
a = gets.to_i
b = ''

if x == 'binary'
while a >= 1
b = b + String(a % 2)
a = a / 2
end
b.reverse
puts b
elsif x == 'octal'
while a >= 1
b = b + String(a % 8)
a = a / 8
end
b.reverse
puts b
end

Answer 9

oh, i found the problem. i need to use gets.chomp for x. and i was using only gets
can you tell me difference between those. i dont understand the explanation on sololearn course... :/