Counting the number of instances when the user selects the correct answer

Hi Everyone,

I constructed a quizz where users can select the answers from a dropdown and when they slect the correct answer a textbox appears when they click the submit button showing if they got the answer correct. Now, the issue I have is that i want to count the number of times the user gets an answer correct. Can anyone assist please?

The snippet of the code is shown below:

   value = app.CoherenceBandwidthDropDown.Value;
       app.Coherencebandwidth.Visible ='on';
       
        if strcmpi(value,'the reciprocal of the multipath spread, which provides a measure of the bandwidth over which frequency components of the transmitted signal will be affected similarly by the channel')
 
        app.Coherencebandwidth.Value='Answer is correct!'; 
       else
       app.Coherencebandwidth.Value='Answer is incorrect!';

        end
        
        value1 = app.PowerDelayProfileDropDown.Value;
        app.PDP.Visible ='on';
        if strcmpi(value1,'represents the average power of the received signal in terms of the delay with respect to the first arrival path in multi-path transmission ')
 
        app.PDP.Value='Answer is correct!';
       else
        app.PDP.Value='Answer is incorrect!';

        end
        
        value2 =app.EvaporationductDropDown.Value;
        app.Evaporationduct.Visible ='on';
        if strcmpi(value2,'is a refractive layer that results from the rapid decrease in humidity level with altitude')
            app.Evaporationduct.Value ='Answer is correct!';
            
        else 
            app.Evaporationduct.Value ='Answer is incorrect!';
            
        end
        value3 = app.CoherencetimeDropDown.Value;
        app.Coherencetime.Visible ='on';
        if strcmpi( value3,'measures the time interval over which the channel response will change very little and is the reciprocal of the doppler spread')
            app.Coherencetime.Value='Answer is correct!';
        else
            app.Coherencetime.Value='Answer is incorrect!';
        end
        value4=app.LineofsightpropagationDropDown.Value;
        app.LOS.Visible ='on';
        if strcmpi( value4,'between two points for which the direct ray is sufficiently clear of obstacles for diffraction to be of negligible effect')
            app.LOS.Value='Answer is correct!';
        else
            app.LOS.Value='Answer is incorrect!';
        end
        value5=app.ShadowingDropDown.Value;
        app.shadowing.Visible ='on';
        if strcmpi( value5,'is the power fluctuation due to obstruction between the transmitter and receiver ')
            app.shadowing.Value='Answer is correct!';
        else
            app.shadowing.Value='Answer is incorrect!';
        end
        value6=app.ScatteringDropDown.Value;
        app.Scattering.Visible ='on';
        if strcmpi( value6,'The spreading of waves in non-uniform manner over an area')
            app.Scattering.Value='Answer is correct!';
        else
            app.Scattering.Value='Answer is incorrect!';
        end
        value7=app.DopplerSpreadDropDown.Value;
        app.Dopplerspread.Visible ='on';
        if strcmpi( value7,'widening of the spectrum of a narrow-band signal transmitted through a multipath propagation channel')
            app.Dopplerspread.Value='Answer is correct!';
        else
            app.Dopplerspread.Value='Answer is incorrect!';
        end
         value8=app.MultipathPropagationDropDown.Value;
         app.Multipathpropagation.Visible ='on';
        if strcmpi( value8,'Propagation of the same radio signal between a transmission point and a reception point over several separate propagation paths')
            app.Multipathpropagation.Value='Answer is correct!';
        else
            app.Multipathpropagation.Value='Answer is incorrect!';
        end
         value9=app.ElevatedductDropDown.Value;
         app.Elevated.Visible='on';
        if strcmpi( value9,'tropospheric radio-duct in which the lower boundary is above the surface of the Earth')
            app.Elevated.Value='Answer is correct!';
        else

            app.Elevated.Value='Answer is incorrect!';
        end
        value10=app.SurfacebasedductDropDown.Value;
        app.Surfacebased.Visible='on';
        if strcmpi( value10,'tropospheric radio- duct that is caused by the temperature inversion due to the advection of warm and dry air over the ocean or cooling of the land.')
            app.Surfacebased.Value='Answer is correct!';
        else
            app.Surfacebased.Value='Answer is incorrect!';
        end
        value11=app.SurfaceductDropDown.Value;
         app.Surfaceduct.Visible='on';
        if strcmpi( value11,'A tropospheric radio-duct in which the lower boundary is the surface of the Earth')
            app.Surfaceduct.Value='Answer is correct!';
        else
            app.Surfaceduct.Value='Answer is incorrect!';
        end

Answer 1

[David Rodriguez]

I think there are multiple ways you could do this. I am not an expert but I would make a 1XN vector of zeros. Then change the N value in the matrix to 1 every time they got something correct. Then sum all the ones at the end.

   value = app.CoherenceBandwidthDropDown.Value;
       app.Coherencebandwidth.Visible ='on';
       
       % Create array of zeros
       answerValues = zeros(1,num_questions);
       
       if q1 = correct
           app.Coherencebandwidth.Value='Answer is correct!'; 
           answerValues(1) = 1;
       else
           app.Coherencebandwidth.Value='Answer is incorrect!'; 
           
       end
       
       if q2 = correct
            app.PDP.Value='Answer is correct!';
            answerValues(2) = 1;
       else
           app.PDP.Value='Answer is incorrect!';

       end
       ...
       num_correct = sum(answerValues);

[tyler seudath]

Thank you! It works amazing

[David Rodriguez]

Awesome!