Can you identify any errors on this flowchart? Or does seem to be all correct?

//This program contuously prompts a user for mles driven uml D is entered. Whle mles are nat 0, galons are entered, and mpg is computed and dsplayed. Deciarations num gallons num moR num END VAL-O output "How many miles did you drive? Enter 0 to quit. input miles mles not output "How many gallans of gas did you use? No output 'End of program imput galons stop mpg miles / galons