This is an excercise from Chris Pine's book "Learn to Program". Ive searched high and low on the web for a straight answer but nothing seems to work. I have ruby installed. I'm in the right directory and I still get an error message that states"ruby: No such file or directory -- calc.rb (LoadError)". I named the program ruby calc.rb. I've moved to the correct directory by typing in "cd Desktop" and the "cd programs" which is where I saved the ruby calc.rb file. I then go to my terminal, type in "ruby calc.rb" as directed and receive the above error. Its getting very frustrating because it appears that every solution I find on any website at all doesn't work for me. Help on this would be greatly appreciated.