a=20;
while a>0 & a<100;
   b=input('place a bet   ')
   
   if b>a;
      error('You cannot bet more than your capital')
      
   else
      n=randn
      
      if n>0
          a=a-b;
          display('you lost, your remaining capital is')
       %  t= [' your remaining capital is ' 'num2str(a)                 '] 
         %display(t)
             %   a
         
      else 
         a=a+b;
         display('you won,your remaining capital is')
             %  a
      end
   end
   a
   if a<=0
      display('you are broke')
   elseif a>=100
      display('you have won it all, cannot win any more!')
      end
   end