Help: if condition with evaluating multiple statements?

Question

Khanh 2014-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/160386-help-if-condition-with-evaluating-multiple-statements

评论： Khanh 2014-10-29

Hi everybody,

My sample if condition have 3 expression. As the following code, how can I evaluate statement 2 and statement 3 when the expressions are true?

a=1
b=1
c=3
if c==2
    disp('C=2')
elseif a~=c
    disp('a~=c') % Statement 2
elseif a~=c && b~=c
    disp('a&b~=c') % Statement 3
end

When I run the code, it just showed 'a~=c', eventhough the expression 'a~=c && b~=c' is true.

Thanks.

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Answer 1

Mischa Kim 2014-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/160386-help-if-condition-with-evaluating-multiple-statements#answer_156845

编辑：Mischa Kim 2014-10-28

在 MATLAB Online 中打开

Khanh, only one of the if ( elseif ) statements is executed. In your case it is the second one, because it is the first condition that evaluates true.

Use instead:

 if c==2
    disp('C=2')
 elseif a~=c
    if b~=c
        disp('a&b~=c') % Statement 3
    else
        disp('a~=c') % Statement 2
    end
 end

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Khanh 2014-10-29

在 MATLAB Online 中打开

Thank you so much. Your answer makes me more understood about using if condition. Actually, I want to show both 'a&b~=c' and 'a~=c' and I found that I have to use each if-end with each expression. It will be as:

   if c==2
      disp('C=2')
   end
   if a~=c && b~=c
       b~=c
          disp('a&b~=c') % Statement 3
   end
   if a~=c
          disp('a~=c') % Statement 2
   end