% Is it the same (functionality) as tangle4.m ?
a= input('Angle a is ');
b= input('Angle b is ');
c= input('Angle c is ');
if (a <=0 ||  b<= 0 || c<=0 ||  a+b+c ~= 180); disp('not a triangle');
else; if (a==b && b==c); disp('equilateral'); elseif  (a==b || a==c || b==c) ;
      disp('isosceles'); else ; disp('scalene'); end ; end
