The SUM function returns a value that is the sum of the arguments. The type of this function depends upon the argument types
                  as follows: 
                  
 
            
             
               	 
                
                  	 
                  
                      
                        		   
                        		   
                        		  
                         
                           			 
                            
                              				
                              | Argument Type | Function Type | 
 
                           		  
                         
                        		  
                         
                           			 
                            
                              				
                              | All arguments integer | Integer | 
 
                           			 
                            
                              				
                              | Numeric | Numeric | 
 
                           			 
                            
                              				
                              | (some arguments may be integer) |  | 
 
                           		  
                         
                        		
                     
                    
                  	 
                 
               
              
            
            
               General Format
 
               	  
               	  
 
               
              
            
            
               Arguments
 
               	  
                
                  	 
                  - Argument-1 must be class numeric. 
                     	 
                  
  
            
            
               Returned Values
 
               	  
                
                  	 
                  - The returned value is the sum of the arguments. 
                     	 
                  
- If the argument-1 series are all integers, the value returned is an integer. 
                     	 
                  
- If the argument-1 series are not all integers, a numeric value is returned in floating-point format.