bash - initialise array filled with zeros

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#!/bin/bash

length=20   # 20 items in initialised array
array=()

for ((i = 0; i < length; ++i))
do
    array[i]=0
done

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#!/bin/bash

length=20   # 20 items in initialised array

array=(); for ((i = 0; i < length; ++i)); do array[i]=0; done