why will the area only work for the circle and not the other shapes

Question

Jack Purdy 2022-2-2

0
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https://ww2.mathworks.cn/matlabcentral/answers/1641655-why-will-the-area-only-work-for-the-circle-and-not-the-other-shapes

评论： Jack Purdy 2022-2-2

when i run the code and type 'circle' when prompted the code works and finds the area, when i type rectangle or cylinder i get an error message telling me there is a problem with line 3. this is the first time i have used mathlab and my new lecturer in uni only reads his notes to us without teaching us to physically write the code.

any help is much appreciated.

prompt = 'shapes (circle, rectangle, cylinder):';

shapes = input(prompt,'s');

if shapes =='circle'

prompt = 'input r:';

r=input(prompt);

A=pi*r^2;

elseif shapes =='rectangle'

prompt = 'enter (length:)';

length=input(prompt,'s');

prompt= 'enter (breadth:)';

breadth=input(prompt,'s');

A=length*breadth;

elseif shapes=='cylinder'

prompt='enter (height:)';

height=input(prompt,'s');

prompt='enter (r):';

r=input(prompt,'s');

A=(pi*r^2)*height;

end

formatspec= 'value in squared units %10.3f';

fprintf(formatspec,A)

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James Tursa 2022-2-2

Please remove your screenshot image and instead post your code as plain text highlighted with the CODE button. We can't copy & run images.

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Answer 1

James Tursa 2022-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/1641655-why-will-the-area-only-work-for-the-circle-and-not-the-other-shapes#answer_887470

编辑：James Tursa 2022-2-2

在 MATLAB Online 中打开

To compare strings, do not use the == operator which does an elementwise compare. Instead, use a function meant for comparing strings. E.g., strcmp( ), strcmpi( ). You could even use isequal( ) in this context.

if strcmp(shapes,'circle')