Switch-case problem

Question

Tiffany McGinnis 2019-2-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/444570-switch-case-problem

回答： OCDER 2019-2-12

inches = -2;

while ~(inches >=59 && inches <= 78)

inches = input('Enter the height in inches(59-78) : ');

end

pounds = 0;

while ~(pounds >= 90 && pounds <= 350)

pounds = input('Enter the weight in pounds(90-350) : ');

end

gender = 4;

while ~(gender >=1 && gender <=2)

gender = input('Is this person a female(1) or male(2)? Enter 1 or 2:');

end

%*****COMPUTE*****

% Compute conversions

meters = inches * 0.0254;

kilograms = pounds / 2.2046;

% Compute bmi

bmi= kilograms / ((meters)^2);

switch(gender)

case {'1'}

ibw = (45.5 + 2.3 * (inches - 60));

case {'2'}

ibw = (50.0 + 2.3 * (inches - 60));

end

% Convert IBW to pounds

ibw_in_pounds = ibw * 2.2046;

After running error message:

Undefined function or variable 'ibw'.

Error in assign04a (line 50)

ibw_in_pounds = ibw * 2.2046;

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Answer 1

OCDER 2019-2-12

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/444570-switch-case-problem#answer_360692

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ibw wasn't defined if gender is not '1' or '2', which are char. You want gender to be a double of value 1 or 2. Here's a fix.

switch gender
    case 1
        ibw = (45.5 + 2.3 * (inches - 60));
    case 2
        ibw = (50.0 + 2.3 * (inches - 60));
    otherwise
        ibw = %SPECIFY DEFAULT VALUE HERE
        
        error('Incorrect gender option'); %OR, throw an error message
end