Problem with simple while loop

[The_Big_K]

I'm not sure what's going wrong here.

What changes should I make to make this run?

class Fib	
	def FibUpTo(max)
 
		i1,i2 = 1,1
 
		yield i1 <= max
			return i1
			i1, i2 = i2, i1+i2
		end
	end
end
 
 
newobj = Fib.new
 
print newobj.FibUpTo(500)

Btw, why does the code output only "1" when I replace 'yield' with 'while'?

[thebasti]

Problem is that it won't work with yield either, i.e. you are probably getting a syntax error. Yield is used to execute a code block within a method that has been passed to it by caller. For example:

def foo
  # execute passed call block giving it a string as a param
  yield 'hello'
end
 
# call method passing it a block with print statement
foo {|x| print x }

This will output 'hello'. It's a stupid example but illustrates the point.

When you replace yield with while it prints only 1 because in the first loop it will call return, which will effectively exit from the FibUpTo method and return a value - the rest of the loop is not executed at all.

You might want to take a look at this and analyze how they did it: http://langexplr.blogspot.com/2007/0...statement.html

[The_Big_K]

Ah, great!

Thanks a ton, thebasti!