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copied!<p>You need to wrap the entire thing <a href="http://www.techotopia.com/index.php/Ruby_While_and_Until_Loops" rel="nofollow">in a <code>while</code> loop</a> and initialize the variable <code>input</code> to a value like <code>nil</code>. </p> <p>The <code>while</code> loop's condition should check if the value is 1 or 2, and it will probably need to be converted to an integer with <code>.to_i</code> since <code>gets</code> will return a string.</p> <pre><code># initialize to nil input = nil # Check if the current value (integer) is 1 or 2 while !([1,2].include?(input)) puts "Do you want to calculate celcius to fahrenheit (1) or fahrenheit to celcius(2)" # Convert the string to an int after getting it as input input = gets.to_i if input == 1 puts "Please enter degrees in Celcius." celcius = gets fahrenheit = (celcius.to_i * 9 / 5) + 32 print "The result is " print fahrenheit puts "." # elsif here, not elseif!! elsif input == 2 puts "Please enter degrees in Fahrenheit." fahrenheit = gets celcius = (fahrenheit.to_i / 9 * 5) - 32 print "The result is:" print celcius puts "." else puts "Please enter option 1 or 2" end end </code></pre> <p>In fact, rather than a <code>while</code> loop, using an <code>until</code> loop (which Ruby has unlike many other languages) is more readable when testing for a negative condition:</p> <pre><code>until [1,2].include?(input) ... end </code></pre> <p>The <code>[1,2].include?(input)</code> is a slicker way of writing</p> <pre><code> if input == 1 || input == 2 </code></pre> <p>... that is easily expanded for additional values in the array.</p>

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