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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';
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

Accepted Answer

Walter Roberson
Walter Roberson on 27 Feb 2021
if score < 0 || score > 100
Jacob Smith
Jacob Smith on 27 Feb 2021
Yep, everything is working as it should. Thanks!

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