can you explain the difference between spacea,spaceb,skipa and skipb. I'

can you explain the difference between spacea,spaceb,skipa
and skipb.
I'm new to learning about as400 and printer files.
can any one give me an example using source code showing the
difference that occurs between using these 4 keywords.
A-Physical file PF004 source
UNIQUE
R RR
STUNAM 10
ROLLNU 5 0
MARKS 3 0
SEX 6
K ROLLNU
4 records present in PF004 are
STUNAM ROLLNU MARKS SEX
KAVYA 12,344 55
FEMALE
MADHAVAN 14,579 60
MALE
RAMYA 14,785 70
FEMALE
KRISHNAN 14,988 72
MALE
B-Printer File PRINT1 source
A R HEADER
A 10 3'STUNAM'
A 10 20'ROLLNU'
A 10 30'MARKS'
A 10 40'SEX'
A R DETAIL
A SPACEB(1)
A STUNAM 10 3
A ROLLNU 5 0 20
A MARKS 3 0 30
A SEX 6 40
A R FOOTER
A SPACEB(1)
A 20'END OF REPORT'

C-RPG/400 Program PRTTPG source
FPF004 I F E DISK
FPRINT1 O E PRINTER
C WRITE HEADER
C READ PF004
60
C *IN60 DOWEQ *OFF
C WRITE DETAIL
C READ PF004
60
C ENDDO
C WRITE FOOTER
C SETON LR

D-spooled file result set

Display Spooled File
File . . . . . : PRINT1
Page/Line 1/10
Control . . . . .
Columns 1 - 130
Find . . . . . .
*...+....1....+....2....+....3....+....4....+....5....+....
6....+....7....+....8....+....9....+....0....+....1....+....
2....+....3
STUNAM ROLLNU MARKS SEX
KAVYA 12344 055
FEMALE
MADHAVAN 14579 060 MALE
RAMYA 14785 070
FEMALE
KRISHNAN 14988 072
MALE
END OF REPORT
Bottom
F3=Exit F12=Cancel F19=Left F20=Right F24=More keys

I have changed from SPACEB to SPACEA now in my printer file
source
E-Changed PRINT1 Source
A R HEADER
A 10 3'STUNAM'
A 10 20'ROLLNU'
A 10 30'MARKS'
A 10 40'SEX'
A R DETAIL
A SPACEA(1)
A STUNAM 10 3
A ROLLNU 5 0 20
A MARKS 3 0 30
A SEX 6 40
A R FOOTER
A SPACEA(1)
A 20'END OF REPORT'

F-Spooled file Result Set after keyword change

Display Spooled File
File . . . . . : PRINT1
Page/Line 1/10
Control . . . . .
Columns 1 - 130
Find . . . . . .
*...+....1....+....2....+....3....+....4....+....5....+....
6....+....7....+....8....+....9....+....0....+....1....+....
2....+....3
KAVYAM 12344U 055KS FEMALE
MADHAVAN 14579 060 MALE
RAMYA 14785 070 FEMALE
KRISHNAN 14988 072 MALE
END OF REPORT

Bottom
F3=Exit F12=Cancel F19=Left F20=Right F24=More keys
Overprinting not displayed.

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