Invalid expression. Need help fixing my function.

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I am new to all of this and cant figure out what it is I am doing wrong. I've been at this for sometime now and I've looked at a lot of reference material and still I have nothing working for me. What error have I made and how can it be fixed? I'm going braindead over here, please and thank you! I've underlined the current trouble spot.
function grade = lettergrade(score)
if score < 0 "OR" score > 100
grade = 'incorrect input';
elseif score <= 90 && score <= 100
grade = 'A';
elseif score >= 80 && score <= 90
grade = 'B';
elseif score >= 70 && score < 80
grade = 'C';
elseif score >= 60 && score < 70
grade = 'D';
elseif score < 60
grade = 'F';
end
Error: File: lettergrade.m Line: 2 Column: 19
Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of
parentheses.

Risposta accettata

Walter Roberson
Walter Roberson il 27 Feb 2021
if score < 0 || score > 100
  5 Commenti
Jacob Smith
Jacob Smith il 27 Feb 2021
I think I'm smellin what you're cooking. Thanks for the help.
Jacob Smith
Jacob Smith il 27 Feb 2021
Yep, everything is working as it should. Thanks!

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