Please what is wrong with this code?

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Ajay Raineni 2020-4-7

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关闭： MATLAB Answer Bot 2021-8-20

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Write a function called valid_date that takes three positive integer scalar inputs year, month, day. If these three represent a valid date, return a logical true, otherwise false. The name of the output argument is valid. If any of the inputs is not a positive integer scalar, return false as well. Note that every year that is exactly divisible by 4 is a leap year, except for years that are exactly divisible by 100. However, years that are exactly divisible by 400 are also leap years. For example, the year 1900 was not leap year, but the year 2000 was. valid = valid_date(2018,4,1) valid = valid_date(2018,4,31)

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Ajay Raineni 2020-4-7

编辑：Geoff Hayes 2020-4-7

在 MATLAB Online 中打开

function valid = valid_date (year, month, day); 
%Check if the input has 3 elements: 
if nargin < 3; 
    error('The date must have 3 elements') 
else 
    nargin==3; 
    validN=true; 
end 
%Check if the 3 elements are integer, scalars and positives: 
%Also for month between 0 and 12. 
%also fot days between 0 and 31. 
if isscalar(year) && (not(mod(year,1))) == true && year>0 
    validY = true; 
else 
    error('Year has to be integer, scalar and positive') 
end 
if isscalar(month) && (not(mod(month,1))) == true && month > 0 && month <= 12 
    validM = true; 
else 
    error('Month has to be integer, scalar, positive and 0<m<=12') 
end 
if isscalar(day) && (not(mod(day,1))) == true && day > 0 && day <= 31 
    validD = true; 
else 
    error('Day has to be integer, scalar, positive and 0<d<=31') 
end 
if (not(mod(year,4)) == true) && (not(mod(year,400)) == true) 
    if month == 1  3  5  7  8  10  12; 
        day <= 31; 
    elseif month == 2; 
        day <= 29; 
    elseif month == 3  4  6  9  11; 
        day <= 30; 
    end 
else 
    if month == 1  3  5  7  8  10  12; 
        day <= 31; 
    elseif month == 2; 
        day <= 28; 
    elseif month == 3  4  6  9  11; 
        day <= 30; 
    end 
end
if validN == true && validY == true && validM == true && validD == true 
    valid = true; 
else 
    valid = false; 
end

Ajay Raineni 2020-4-7

inputs valid =valid_date(2018,4,1) valid = valid_date(2018,4,31) valid= valid_date(2025,6,-8)

Geoff Hayes 2020-4-7

在 MATLAB Online 中打开

Ajay - don't lines like

if month == 1 3 5 7 8 10 12;

cause an error for you? You probably want to replace with something similar to

if ismember(month, [1 3 5 7 8 10 12])

I strongly suggest that you use the MATLAB debugger to step through the code while the function is running. As you step through each line, ask yourself if what you are trying to do makes sense and that the answer you get is expected.

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