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请教一个比较指令方面的问题



现在我要比较两个Q值是否相等,由于这两个值是实时变化的,由于ADC采样的精度,还有采样的时间问题,这二个值不可能完全会相等.  只能在高位相等,如:0.015889800,与0.015087569时,    我只要它们的的后三位相等或后二位相等就好了.  后面的几位忽略.   如何做到?