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

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)

[James Tursa]

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

Answer 1

[James Tursa]

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')

[Jack Purdy]

ill try now thank you :)