Switch Case Construction Code help

(Ajay deleted the question, so I (MF) am restoring it.)

I am trying to create a function that takes a cell array containing strings as an input. The string can be triangle, square, pentagon, hexagon, heptagon, octagon, nonagon, or decagon. The output is the sum of the interior angles of the requested shape. If the input is not valid, the code should return a 0. The input should be able to handle cell arrays containing multiple strings and output the corresponding angles as a vector.

I thought I got it, but then I found out I am required to use "switch case" construction, which I have no idea how to do. I tried solving it twice, and both times i got errors. Here are the 2 codes I worked out: What am I doing wrong? I tried reading on switch case construction, and I don't get what's wrong with either code?!

switch InteriorAngle(input)
    case 'triangle'
        disp ('180')
    case 'square'
        disp ('360');
    case 'pentagon'
        disp ('540');
    case 'hexagon'
        disp ('720');
    case 'heptagon'
        disp ('900');
    case 'octagon'
        disp ('1080');
    case 'nonagon'
        disp ('1260');
    case 'decagon'
        disp ('1440');
    otherwise
        disp ('0');
end

CODE 2

function output = InteriorAngle(input)
n=input('s')
switch InteriorAngle
    case ('triangle')
        n=3;
        sum=(n-3).*(180)
    case ('square')
        n=4;
        dispsum=(n-3).*(180)
    case('pentagon')
        n=5;
        sum=(n-3).*(180)
    case ('hexagon')
        n=6;
        sum=(n-3).*(180)
    otherwise
        disp ('0')
end

[Azzi Abdelmalek]

what does that mean?

[Walter Roberson]

Looks like an attempt to edit the meaningful part of a question out of existence :(

[Matt Fig]

Ajay is particularly bad about this. I personally will be restoring what I can of his old questions and ignoring further questions from Ajay....

[Matt Fig]

Saved from google cache:

I am trying to create a function that takes a cell array containing strings as an input. The string can be triangle, square, pentagon, hexagon, heptagon, octagon, nonagon, or decagon. The output is the sum of the interior angles of the requested shape. If the input is not valid, the code should return a 0. The input should be able to handle cell arrays containing multiple strings and output the corresponding angles as a vector.

I thought I got it, but then I found out I am required to use "switch case" construction, which I have no idea how to do. I tried solving it twice, and both times i got errors. Here are the 2 codes I worked out: What am I doing wrong? I tried reading on switch case construction, and I don't get what's wrong with either code?!

switch InteriorAngle(input) case 'triangle' disp ('180') case 'square' disp ('360'); case 'pentagon' disp ('540'); case 'hexagon' disp ('720'); case 'heptagon' disp ('900'); case 'octagon' disp ('1080'); case 'nonagon' disp ('1260'); case 'decagon' disp ('1440'); otherwise disp ('0'); end

CODE 2

function output = InteriorAngle(input) n=input('s') switch InteriorAngle case ('triangle') n=3; sum=(n-3).*(180) case ('square') n=4; dispsum=(n-3).*(180) case('pentagon') n=5; sum=(n-3).*(180) case ('hexagon') n=6; sum=(n-3).*(180) otherwise disp ('0') end

Answer 1

[Azzi Abdelmalek]

switch input('InteriorAngle')
case 'triangle'
      disp ('180')
  case 'square'
      disp ('360');
  case 'pentagon'
      disp ('540');
  case 'hexagon'
      disp ('720');
  case 'heptagon'
      disp ('900');
  case 'octagon'
      disp ('1080');
  case 'nonagon'
      disp ('1260');
  case 'decagon'
      disp ('1440');
  otherwise
      disp ('0');
end

[Ajay]

i'm stil getting an error? when i run

in = cell(1,3);

in{1,1} = 'triangle';

in{1,2} = 'hexagon';

in{1,3} = 'dodecagon';

out = InteriorAngle(in)

[Julien]

because your function InteriorAngle doesn't exist . You have to create it first. Put this code in a m-file, save it with the same name of the function.

function InteriorAngle(in)

for i=1:length(in)

switch char(in(i))

case 'triangle'
      disp ('180')
  case 'square'
      disp ('360');
  case 'pentagon'
      disp ('540');
  case 'hexagon'
      disp ('720');
  case 'heptagon'
      disp ('900');
  case 'octagon'
      disp ('1080');
  case 'nonagon'
      disp ('1260');
  case 'decagon'
      disp ('1440');
  otherwise
      disp ('0');
end

end

and after that you can do this:

in = cell(1,3);

in{1,1} = 'triangle';

in{1,2} = 'hexagon';

in{1,3} = 'dodecagon';

InteriorAngle(in)

as the function returns no outputs (just dips function used) you don't have to specify an output variable.

[Walter Roberson]

You do not show any "in" in your original code.

input() as a request to the user to supply input at the command line. If the data is already in a cell array, the switch() should be on the contents of one cell, such as

switch in{K}

[Azzi Abdelmalek]

 function output = InteriorAngle(s)
 switch s
    case ('triangle')
        n=3;
        sum=(n-3).*(180)
    case ('square')
        n=4;
        dispsum=(n-3).*(180)
    case('pentagon')
        n=5;
        sum=(n-3).*(180)
    case ('hexagon')
        n=6;
        sum=(n-3).*(180)
    otherwise
        disp ('0')
end

%

 InteriorAngle('triangle')

[Ajay]

OH i see i see. thanks :)