Câu trả lời:
var A: integer;
begin
write('Nhap vao mot so A='); readln(A);
if A>0 then write('So A la so nguyen duong');
if A<0 then write('So A la so nguyen am');
If A=0 then write('So A khong la so nguyen am va khong la so nguyen duong');
readln;
end.