I have 5 text file like :
FILE1

A B C D
2 3 4 NULL
13 20 3 7
23 NULL 0 3
FILE2

B D C A
20 3 0 1
3 0 20 NULL
NULL 2 1 13


WHAT I WANT TO DO IS

1- READ COLUMN HEADER FROM FILE1 TO AN ARRAY1 AND COLUMN HEADER FROM FILE2 TO AN ARRAY2
2- READ THE COLUMNS’S VAULES FOR EACH COLUMN TO AN ARRAY
3- IF COLUMN HEADER FROM FILE1=COLUMN HEADER FROM FILE2 MAKE SOME OPERATION TO THE CORRESPONDING COLUMNS VALUES