Column name of last non zero value in row in Excel

Question

How I can get column name of last non zero value in row, using Excel functions.

Example:

A:E - columns with values x - function result

A B C D E x

0 0 1 0 0 C
1 0 2 1 2 E
0 1 1 0 1 E
1 1 1 1 1 E
0 0 0 0 0 

Answer 1

This works:

=IFERROR(CHAR(AGGREGATE(14,6,COLUMN(A1:E1)/(A1:E1<>0),1)+64),"")

Answer 2

These are array-formulas that must be entered using CTRL + SHIFT + ENTER :

This works up to ZZ:

=IFERROR(SUBSTITUTE(MID(CELL("address",OFFSET(A1,0,MAX(IF(A1:AA1<>0,COLUMN(A1:AA1),0))-1)),2,2),"$",""),"")

This works for all columns:

=IFERROR(MID(CELL("address",OFFSET(A1,0,MAX(IF(A1:AAA1<>0,COLUMN(A1:AAA1),0))-1)),2,FIND("$",MID(CELL("address",OFFSET(A1,0,MAX(IF(A1:AAA1<>0,COLUMN(A1:AAA1),0))-1)),2,99))-1),"")

Update: The accepted answer is more efficient. It assumes numeric values but could be easily updated to handle non-numeric values as well. However it could be optimised further:

=IFERROR(MID(SUBSTITUTE(ADDRESS(1,MAX(IF(A2:XED2,COLUMN(A2:XED2)))),"$1",""),2,3),"")

Answer 3

Enter with CTRL + Shift + Enter :

=IFERROR(MID(ADDRESS(ROW(),MAX(IF(A2:E2,COLUMN(A2:E2)))),2,SEARCH("$",ADDRESS(ROW(),MAX(IF(A2:E2,COLUMN(A2:E2)))),2)-2),"")