Use Switch function to find day of year

Write an executable script file (m-file) that takes no inputs and calculates the day of year associated with any given month, day, and year. The program should be able to check to see if the data entered by the user is valid. If the inputs are invalid, the program should tell the user what is wrong and quit. The year should be a number greater than zero, the month should be a number between 1 and 12, and the day should be a number between 1 and a maximum that depends on the month selected. Use a switchconstruct to implement the bounds checking performed on the day. Make sure to include leap years.

I am stuck, it only returns a number 16

month = input('Enter month (1-12):');
day = input('Enter day(1-31):');
year = input('Enter year(greater than zero xxxx):');


if mod(year,400) == 0
leap_day = 1; 
elseif mod(year,100) == 0
leap_day = 0; 
elseif mod(year,4) == 0
leap_day = 1; 
else
leap_day = 0; 
end



    
    switch('day')
        case{1}
            day_of_year=day
        case{2}
             day_of_year=total(day,leap_day,31)
        case{3}
            day_of_year={day + 28 + leap_day+31}
        case{4}
            day_of_year={day + 28 + leap_day+31+30}
        case{5}
            day_of_year={day + 28 + leap_day+31+30+31}
        case{6}
            day_of_year={day + 28 + leap_day+31+30+31+30}
        case{7}
            day_of_year={day + 28 + leap_day+31+30+31+30+31}
        case{8}
            day_of_year={day + 28 + leap_day+31+30+31+30+31+31}
        case{9}
            day_of_year={day + 28 + leap_day+31+30+31+30+31+31+30}
        case{10}
            day_of_year={day + 28 + leap_day+31+30+31+30+31+31+30+31}
        case{11}
            day_of_year={day + 28 + leap_day+31+30+31+30+31+31+30+31+30}
        case{12}
            day_of_year={day + 28 + leap_day+31+30+31+30+31+31+30+31+30+31}
            
        otherwise
                fprintf('invalid entry');
    end
            
            

[Tommy]

Here:

switch('day')

Use

switch(day)

instead.

[Geoff Hayes]

Since day can take on any integer from 1 to 31, do you really want to use a switch statement? Or should you be switching on month instead? (Even that can probably be done without a switch...)

[JohnLanger]

The problem specifically asked for a switch statement. I just don't know how to formulate the case exression correctly.

[Geoff Hayes]

I think by Use a switchconstruct to implement the bounds checking performed on the day., the intention is to make sure that the day entered is valid for the month (since that is the only bounds checking that you will do). For example,

switch (month)
    case 1
        if day < 1 || day > 31
            error(sprintf('Invalid day (%d) for month (%d)\n', day, month);
        end
    case 2
        if day < 1 || (leap_day == 1 && day > 29) || (leap_day == 0 && day > 28)
            error(sprintf('Invalid day (%d) for month (%d)\n', day, month);
        end
    % etc.
end