计算堆栈可靠性的计算表格

Spreadsheet calculations for availability of stacks

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电子表格4，“堆栈”，计算堆栈的可用性，如下图8所示。

Spreadsheet sheet 4, "Stacks", calculates the availability of a stack, and is shown in Figure 8, below.

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复制计算堆栈上当前最顶端的值，然后将副本推送到计算堆栈上。

Copies the current topmost value on the evaluation stack, and then pushes the copy onto the evaluation stack.

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