whats semicolon?

["@{-_-}@" <nuhvok@terra.es>]

Im triying to develop a code in ADA.  Im a newbie :).  This code must 
ouput a series number.

If I try a number N lagger than nought the program must ouput a 
progressive series number from 1 as far as N.

If I try a number N smaller than nought, the program must output a 
progressive series number from -1 as far as N.

If I try nouth the program must output "ZERO".

I tried the following intructions:

with Text_Io, Ada.Integer_Text_IO;
use Text_Io, Ada.Integer_Text_IO;

procedure Practica1 is

n: integer;
c: integer :=0;

begin

	put ("Escribe un numero entero: ");
	get (n);
	if n = 0 then

		put("cero")

	else
	
		IF N > 0 then
			for c in 0..n loop
				put (c);
			end loop
		else
			for c in -1..n loop
				put (c);
			end loop
		end if
	
	end if

end Practica1;

When I try to compile it, the objectada show the following error:

practica1.adb: Error: line 20 col 2 Parse error: expected SEMICOLON, got 
ELSE, Inserting SEMICOLON

Whats SEMICOLON?

Thx to community!!

gretting2all!!!