help required with scripts file

How do I get my script to display "Invalid input" whenever a user inputs a value less than zero or greater than 90 degrees? I need some help with this please

%%
%script file

h=figure;

clf(h);

AxesH = axes('NextPlot','add');

while (1)
    
play = menu('Welcome. Do you want to play?: ', 'Yes', 'No');

    switch play
        
        case (1)
            
        b = input('Please input angle value: ');
        
            if b >= 0 || b <=90 
                
                [x,y] = HDTask1function_f(b);
                
                z = rand()*3.5;
                
                j = z+0.5;
                
                hndl2=plot([z j],[0 0],'LineWidth',5);
                
                hold on
                
                set(gca,'Xlim',[0 4])
                
                set(gca,'Ylim',[0 4])
                
                hndl=plot(x(1),y(1),'r.','MarkerSize',50);
                
                for ii=2:length(x)
                    
                    drawnow;
                    
                    set(hndl,'XData', x(ii), 'YData', y(ii));
                    
                    pause(0.0025);
                    
                    if y(ii:end) < 0
                        
                        y(ii:end) = 0;
                        
                        pause(0.5);
                        
                        if x(1,ii) > z && x(1,ii) < j
                            
                            disp('You gained a point');
                        
                        end
                        
                        break
                    
                    end
                    
                end
                
            elseif b < 0 || b >90
            
            disp('Invalid input. Please input an angle in the range of [0 - 90]');
            
            break
            
            end
            
        case(2)
            
            disp('Thankyou for visiting')
            
            break;
    
    end
    
end

%%
%function file
function [x,y]=HDTask1function_f(a)
x0=0;
y0=1.8;
v0=4;
g=9.8;
t=0:0.01:5;
x=x0+v0*cos(a*(pi./180)).*t;
y=y0+v0*sin(a*(pi./180)).*t-(g.*t.^2)/2;
end

[Rik]

This time I edited your question for you. Next time, please use the tools explained on this page to make your question more readable. Your question is not urgent, the reason for that is explained here.

Have a read here and here. It will greatly improve your chances of getting an answer. You can find guidelines for posting homework on this forum here.

Answer 1

[Deepak Gupta]

Hello Aaron,

Change your code according to below lines, it should work.

if (b >= 0) && (b <=90) 
    %put your code here
else
    disp('Invalid input. Please input an angle in the range of [0 - 90]');
    break
end

Thanks,

Deepak