a = input(' Give a ' );
b= 20; c= 30;
fprintf('a= %d b=%d c=%d \n',a,b,c);
go_on= input('Press enter for the answer');
if ( a+ b > c)
   fprintf('This ');
elseif (a+c > b )
   fprintf('That ');
else
   fprintf('What ');
end
fprintf('Alex\n');
