Trying to run a user input factorial program.

Hello, I am trying to make a program that ask the user to select a factorial from 0 to 20 and produce an answer. But also display an error message if a number was picked that was less than 0 or greater than 20. I made this program but I'm not getting anywhere. Can anybody help me? Thank you.

Answer 1

[Walter Roberson]

while true
  x = input(....)
  if x is in limits
    break;
  end
end
compute factorial

[Neil Lallkissoon]

while (x > 0)||(x > 20)
  x = input('Enter a number to be factorialized from 1 to 20: ')
  if (x < 0)||(x < 20)
     break;
  end
  end
y = factorial(x)

Is this what it is supposed to look like? Thank you for helping me by the way.

[Walter Roberson]

"while true" is literal. It means to loop forever, until something inside the loop tells the loop to exit.

And notice I said "x is in limits". Think about what your "if" does for negative values.