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Trying to run a user input factorial program.

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Neil Lallkissoon
Neil Lallkissoon 2017-2-26
评论： Walter Roberson 2017-2-26
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.

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回答（1 个）

Walter Roberson
Walter Roberson 2017-2-26
while true
x = input(....)
if x is in limits
break;
end
end
compute factorial
  2 个评论
Neil Lallkissoon
Neil Lallkissoon 2017-2-26
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
Walter Roberson 2017-2-26
"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.

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