Numeric operators
                All numeric operators use the numeric values of the operands and return 
 a numeric value as result. 
                
                    Numeric operators
                    
                    
                    
                        
                            | Operator | 
                            Description | 
                        
                    
                    
                        
                            | +
                     | 
                            Sign for positive number (unary operator) 
 or arithmetic addition. The binary operation returns the sum of the two 
 operands.  | 
                        
                        
                            | -
                     | 
                            Sign for negative number (unary operator) 
 or arithmetic subtraction. The unary operation returns the operand multiplied 
 by -1, and the binary the difference between the two operands.  | 
                        
                        
                            | *
                     | 
                            Arithmetic multiplication. The operation returns 
 the product of the two operands.  | 
                        
                        
                            | /
                     | 
                            Arithmetic division. The operation returns 
 the ratio between the two operands.  |