"COBOL uses a fixed width character format for all data (yes even for COMP). If you want a four digit number, then you have to use 4 character positions."
That is incorrect. USAGE COMP will use binary, with the number number of bytes depending on the number of digits in the PIC. COMP-1 specifically takes 4 bytes. COMP-3 uses packed decimal (4 bits per digits).
That is incorrect. USAGE COMP will use binary, with the number number of bytes depending on the number of digits in the PIC. COMP-1 specifically takes 4 bytes. COMP-3 uses packed decimal (4 bits per digits).