1)
var
a, n, s: integer;
begin
write('n = ');
Readln(n);
a := 1;
while a <= n do
begin
s := s + a;
a := a + 1;
end;
writeln(s);
end.
2)
var
a, n: integer;
begin
write('n = ');
Readln(n);
a := 1;
while a <= n do
begin
writeln(2 * a);
a := a + 1;
end;
end.
3)
var
a, b: integer;
begin
write('Введите числа a и b: ');
Readln(a, b);
while a <= b do
begin
writeln(a, '^2 = ', sqr(a));
a := a + 1;
end;
end.
Python 3.7.0
def sign(x):
if x > 0:
return 1
if x < 0:
return -1
if x == 0:
return 0
x = int(input("Введите х: "))
print(sign(x))