The negation and identity operators in action. : Operators « PL SQL Operators « Oracle PL/SQL Tutorial

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2. PL SQL Operators
3. Operators

SQL>
SQL> SET SERVEROUTPUT ON
SQL> DECLARE
  2    x   NUMBER;
  3  BEGIN
  4    DBMS_OUTPUT.PUT_LINE(-242.24);
  5    x := 5;
  6    DBMS_OUTPUT.PUT_LINE(-x);
  7     x := -5;
  8     DBMS_OUTPUT.PUT_LINE(-x);
  9     DBMS_OUTPUT.PUT_LINE(+10);
 10     DBMS_OUTPUT.PUT_LINE(+x);
 11  END;
 12  /
-242.24
-5
5
10
-5

PL/SQL procedure successfully completed.

SQL>