The Excel Address function takes row and column numbers and returns a cell reference as a text string.
The syntax of the function is:
where the arguments are as follows:
row_num    The row number to use in the reference 
column_num    The column number to use in the reference 
[abs_num]   
An optional argument, which specifies whether the reference should contain absolute or relative references. abs_num can take on the following values : 1  denotes absolute row & column reference 2  denotes absolute row & relative column reference 3  denotes relative row & absolute column reference 4  denotes relative row & column reference If this argument is omitted, it takes on the default value 1 (absolute references) 
[a1]   
An optional logical argument that defines the style of the returned reference. This can be either :
(For more details, see the page on Excel Reference Styles) 
[sheet_text]   
An optional text argument that specifies the sheet name.
If this argument is omitted, the sheet name is blank (ie. the reference relates to the current worksheet) 
The following spreadsheets show simple examples of the Excel Address function. The format of the function is shown in the spreadsheet on the left and the results are shown in the spreadsheet on the right.
Formulas:

Results:

Note that the function in cell A4 of the above spreadsheet omits the [a1] argument. This argument therefore takes the default value of TRUE.
Note also, that cell A5 in the above spreadsheet combines the ADDRESS function with the ROW function and the COLUMN function to display the reference to the current cell.
Further information and examples of the Excel Address function can be found on the Microsoft Office website.
If you get an error from the Excel Address function, this is likely to be the #VALUE! error :
#VALUE!   
Occurs if the supplied arguments are not recognised as the accepted values. I.e. if either:
