PL SQL - Largest of 3 numbers

-- Largest among three numbers using PL SQL

declare
a number(10);
b number(10);
c number(10);
begin
a:=&a;
b:=&b;
c:=&c;
if a>b and a>c then        -- checking if a is the largest.
dbms_output.put_line(chr(10)||a||' is largest');
else if b>c then   -- checking if b is the largest.
dbms_output.put_line(chr(10)||b||' is largest');
else    -- c is largest.
dbms_output.put_line(chr(10)||c||' is largest');
end if;
end if;
end;
/

Output