uses crt;
var a:integer;
begin
clrscr;
write('Nhap a='); readln(a);
if a<0 then writeln(a,' la so am')
else if a>0 then writeln(a,' la so duong')
else writeln(a,' khong la so am cung khong la so duong');
readln;
end.
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.