12 lines
489 B
Text
12 lines
489 B
Text
function binsearch( array() as integer, target as integer ) as integer
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'returns the index of the target number, or -1 if it is not in the array
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dim as uinteger lo = lbound(array), hi = ubound(array), md = (lo + hi)\2
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if array(lo) = target then return lo
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if array(hi) = target then return hi
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while lo + 1 < hi
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if array(md) = target then return md
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if array(md)<target then lo = md else hi = md
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md = (lo + hi)\2
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wend
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return -1
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end function
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