我正在研究这个 RosettaCode 挑战的蛮力实现。我希望能够处理比 USAGE BINARY-DOUBLE 更大的数字，所以我写了一个简单的 bignum 例程来添加。
如果我想将自己限制在一定数量的迭代中，并且该数量大于 9(18)，那么这很棘手。所以我想到了在数组的特定元素上使用 88 的想法，因此下面的代码。
03 DIGITS1 OCCURS 40 TIMES PIC 9.
03 FILLER REDEFINES DIGITS1.
05 FILLER pic 9999999999.
05 FILLER pic 999999999.
05 filler pic 9.
88 EOR value 1.
05 filler pic 9999999999.
05 filler pic 9999999999.
所以我仍然想知道这是否是唯一的方法，或者当我达到 10 ^ 20 时是否有其他处理方式。
这是完整的“解决方案”。这是一团糟，但它几乎工作。
identification division.
program-id. Program1.
data division.
working-storage section.
01 COUNTER.
03 DIGITS1 OCCURS 40 TIMES PIC 9.
03 FILLER REDEFINES DIGITS1.
05 filler pic 9999999999.
05 FILLER pic 9999999999.
05 filler pic 9999999999.
05 filler pic 999.
05 filler pic 9.
88 EOR value 1.
05 filler pic 999999.
01 INCREMENTOR.
03 DIGITS1 OCCURS 40 TIMES PIC 9.
01 ACCUMULATOR.
03 DIGITS1 OCCURS 40 TIMES PIC 9.
01 IN-NUMBER usage binary-double unsigned.
01 I USAGE BINARY-DOUBLE UNSIGNED.
01 N USAGE BINARY-DOUBLE UNSIGNED.
01 THREE-COUNTER USAGE BINARY-CHAR value 1.
88 IS-THREE VALUE 3.
01 FIVE-COUNTER USAGE BINARY-CHAR value 1.
88 IS-FIVE VALUE 5.
01 ANSWER pic x(40).
procedure division.
initialize COUNTER ACCUMULATOR incrementor.
10-MAIN-PROCEDURE.
move 1 to IN-NUMBER.
call "MOVENUMTOBIGNUM" using by content in-number
by reference incrementor.
move 1 to IN-NUMBER.
call "MOVENUMTOBIGNUM" using by content in-number
by reference counter.
PERFORM 20-INNER-LOOP WITH TEST AFTER UNTIL eor.
move ACCUMULATOR to ANSWER.
inspect answer REPLACING LEADING '0'
by space.
DISPLAY answer.
STOP RUN.
20-INNER-LOOP.
IF IS-THREE OR IS-FIVE
call "ADDBIGNUMS" using by content counter
by reference accumulator
IF IS-THREE
MOVE 1 TO THREE-COUNTER
ELSE
ADD 1 TO THREE-COUNTER
END-IF
IF IS-FIVE
MOVE 1 TO FIVE-COUNTER
ELSE
ADD 1 TO FIVE-COUNTER
END-IF
ELSE
ADD 1 TO FIVE-COUNTER END-ADD
ADD 1 TO THREE-COUNTER END-ADD
END-IF.
call "ADDBIGNUMS" using by content INCREMENTOR
by reference counter.
EXIT.
end program Program1.
identification division.
PROGRAM-ID. MOVENUMTOBIGNUM.
ENVIRONMENT DIVISION.
DATA DIVISION.
WORKING-STORAGE SECTION.
01 num-MOD usage binary-CHAR.
01 num-DIV usage binary-DOUBLE unsigned.
01 IN-COUNTER usage binary-char.
LINKAGE SECTION.
01 num usage binary-double.
01 BIGNUM.
03 DIGITS1 OCCURS 40 TIMES PIC 9.
PROCEDURE DIVISION USING NUM BIGNUM.
10-MOVE.
move 40 to IN-COUNTER.
perform until num = 0
divide num by 10
giving num-DIV
REMAINDER num-MOD
end-divide
move num-MOD to DIGITS1 of BIGNUM(IN-COUNTER)
move NUM-DIV to NUM
subtract 1 from IN-COUNTER end-subtract
END-PERFORM.
GOBACK.
END PROGRAM MOVENUMTOBIGNUM.
*Add Bignum to Bignum, modifying second Bignum in situ
identification division.
program-id. ADDBIGNUMS.
DATA DIVISION.
WORKING-STORAGE SECTION.
01 IN-COUNTER usage binary-char.
01 ADD-FLAG pic 9.
88 STILL-ADDING VALUE 0.
88 DONE-ADDING VALUE 9.
01 CARRIER usage binary-char.
01 REGISTER-A usage binary-char.
LINKAGE SECTION.
01 BIGNUM1.
03 DIGITS1 OCCURS 40 TIMES PIC 9.
01 BIGNUM2.
03 DIGITS1 OCCURS 40 TIMES PIC 9.
PROCEDURE DIVISION USING BIGNUM1 BIGNUM2.
10-ADD-WITH-CARRY.
move zero to CARRIER.
move 40 to IN-COUNTER.
move zero to ADD-FLAG.
perform until DONE-ADDING
add DIGITS1 of BIGNUM1(IN-COUNTER)
DIGITS1 of BIGNUM2(IN-COUNTER)
CARRIER GIVING REGISTER-A
END-ADD
move zero to CARRIER
if REGISTER-A > 9
divide REGISTER-A by 10
giving CARRIER
remainder REGISTER-A
end-divide
else
if REGISTER-A = zero
move 9 to ADD-FLAG
END-IF
end-if
if STILL-ADDING
move REGISTER-A to DIGITS1 of BIGNUM2(IN-COUNTER)
subtract 1 from IN-COUNTER end-subtract
end-if
END-PERFORM.
goback.
END PROGRAM ADDBIGNUMS.