It says : Not a valid input. You must enter freshman, sophomore, junior, or senior. How can i fix it ?

studentsYear = menu('Chose your year in school','freshman','sophomore','junior','senior');

switch(studentsYear)

    case 'freshman' 
        final_day = 'Monday'; 
    case 'sophomore'
        final_day = 'Tuesday'; 
    case 'junior'
        final_day = 'Wednesday'; 
    case 'senior'
        final_day = 'Thursday';
    otherwise 
        fprintf('Not a valid input.\nYou must enter freshman, sophomore, junior, or senior.\n');
        final_day=0; 
end
if ischar(final_day)
    fprintf('Your final will be given on %s.\n', final_day);
end

Answer 1

[YT]

Your variable studentsYear returns a value 1, 2, 3 or 4 as defined by the order in your menu. So you should use the integers 1, 2, 3 and 4:

studentsYear = menu('Chose your year in school','freshman','sophomore','junior','senior');

switch(studentsYear)
    case 1 %freshman
        final_day = 'Monday'; 
    case 2 %sophomore
        final_day = 'Tuesday'; 
    case 3 %junior
        final_day = 'Wednesday'; 
    case 4 %senior
        final_day = 'Thursday';
    otherwise 
        fprintf('Not a valid input.\nYou must enter freshman, sophomore, junior, or senior.\n');
        final_day=0; 
end
if ischar(final_day)
    fprintf('Your final will be given on %s.\n', final_day);
end

[Brain Adams]

Firstly, thank you so much. I have one question. Should i write the integers when i am using the menu? It is necessary because i am using menu, right?

[YT]

I'm not sure if I understand your question, but you can leave the menu as it is now. You do not need to change the menu names into integer values in order for it to work.