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IDENTIFICATION DIVISION.
PROGRAM-ID. day_03.
AUTHOR. Trey Bastian.
ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
SELECT input-file ASSIGN TO "./input.txt"
ORGANIZATION IS LINE SEQUENTIAL.
DATA DIVISION.
FILE SECTION.
FD input-file.
01 input-line PIC Z(4096).
WORKING-STORAGE SECTION.
01 idx PIC 9(4).
01 idx-2 PIC 9(4).
01 len PIC 9(4).
01 maxim PIC 9 VALUE 0.
01 digit PIC 9 VALUE 0.
01 joltage PIC XX.
01 result PIC 9(10) VALUE 0.
01 eof PIC X.
88 eof-y VALUE "Y".
88 eof-n VALUE "N".
PROCEDURE DIVISION.
OPEN INPUT input-file.
SET eof-n to TRUE.
PERFORM UNTIL eof-y
READ input-file AT END
SET eof-y to TRUE
NOT AT END
MOVE FUNCTION LENGTH(FUNCTION TRIM(input-line)) TO len
MOVE 0 TO maxim
*first pass leave something on the right
PERFORM VARYING idx FROM 1 UNTIL idx > len - 1
MOVE FUNCTION NUMVAL(input-line(idx:1)) TO digit
IF maxim < digit
MOVE digit TO maxim
MOVE idx TO idx-2
END-IF
END-PERFORM
* need the next index
MOVE maxim TO joltage(1:1)
MOVE 0 TO maxim
ADD 1 TO idx-2
PERFORM VARYING idx-2 FROM idx-2 UNTIL idx-2 > len
MOVE FUNCTION NUMVAL(input-line(idx-2:1)) TO digit
IF maxim < digit
MOVE digit TO maxim
END-IF
END-PERFORM
MOVE maxim TO joltage(2:1)
ADD FUNCTION NUMVAL(joltage) TO result
END-READ
END-PERFORM.
CLOSE input-file.
DISPLAY result.
STOP-RUN.
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