2023-09-16 17:28:03 -07:00
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func$ mult a$ b$ .
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2023-07-01 11:58:00 -04:00
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a[] = number strchars a$
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b[] = number strchars b$
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len r[] len a[] + len b[]
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for ib = len b[] downto 1
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h = 0
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for ia = len a[] downto 1
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h += r[ia + ib] + b[ib] * a[ia]
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r[ia + ib] = h mod 10
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h = h div 10
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.
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r[ib] += h
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.
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r$ = ""
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for i = 1 to len r[]
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if r$ <> "" or r[i] <> 0 or i = len r[]
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r$ &= r[i]
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.
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.
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2023-09-16 17:28:03 -07:00
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return r$
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2023-07-01 11:58:00 -04:00
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.
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2023-09-16 17:28:03 -07:00
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print mult "18446744073709551616" "18446744073709551616"
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