lesson_1_ex_1_19_20

a=input("Dose to a:");
b=input("Dose to b:");
c=input("Dose to c:");
D=b^2-4*a*c
if D>0
  x1=(-b+sqrt(D))/2*a
  x2=(-b-sqrt(D))/2*a
  k=sprintf("Oi luseis einai x1= %f kai x2=%f",x1,x2);
  disp(k)
elseif D==0
  x=-b/2*a
  k=sprintf("I lusi einai x= %f",x);
  disp(k)
else
  disp("Den exei pragmatikes luseis")
endif