return 0.0 or whatever seems appropriate, depending on context do some special handling like skipping the list element,
HOW DO YOU DO DIVISION WITH ZEROS CODE
On the other hand one can often see code which avoids a division-by-zero problem by checking the divisor for equality with zero before the division takes place: if divisor = 0.0 then
So this complaint makes perfect sense to warn about potentially dangerous code.Ī typical approach for such situations is to check for a margin, an epsilon, which should compensate all rounding effects, e. Thus, a number value for 5 ÷ 0 is NOT POSSIBLE.Source code analyzers (like SonarQube) complain about float (or double) equality comparisons because equality is a tricky thing with floats the values compared can be the results of computations which often have minute rounding effects, so that 0.3 - 0.2 = 0.1 often returns false while mathematically it should always return true (as tested with Python 2.7). You should notice that the answer is getting bigger and bigger (closer to infinity) as the divisor gets smaller and smaller (closer to zero). Use your calculator to do this arithmetic: You can consider 5 0 from another point of view by thinking about a sequence of arithmetic results. In somewhat more formal talk, 5 0 =, in other words, not possible. What the calculator is telling you, in a politically correct way, is "Idiot, you can't divide by zero because the division task doesn't make sense!" For 5 0, the display showed "E" or "ERROR".Now let us return to the calculator results: It doesn't matter how many litres your bucket can hold because you are not going to use the bucket. You are trying to empty the barrel by not using a bucketful at all. "How many litres must each bucketful hold?" This is why the answer to 5 0 is sometimes referred to as (infinity).įor the question "how many in each group?", 5 0 means the barrel has 5 litres of water in it and you must use 0 bucketfuls of water to empty it. You will never be able to empty the barrel because your bucket holds 0 litres of water. The question becomes:Ĭlearly, you are setting yourself up for a futile task. Again, let us imagine a large barrel and a bucket to empty it.įor the question, "how many groups?", 5 0 means the barrel has 5 litres of water in it and you use a bucket that holds 0 litres of water to empty it. Since the barrel is already empty, the bucket needs to hold 0 litres of water. "How many 5-litre bucketfuls (groups) do you need to empty the barrel?"Ĭlearly, the answer is that you need zero 5-litre bucketfuls, because the barrel is already empty.įor the question "How many in each group?", 0 5 = ? means the barrel is empty and you use 5 bucketfuls to empty the barrel. Imagine the context for splitting up into equal groups is emptying a large barrel by using a bucket:įor the question "how many groups?", 0 5 = ? means the barrel has 0 litres of water in it (is empty) and you use a bucket that holds 5 litres to empty the barrel. Let us consider 0 5 and 5 0 for each kind of question: Two two kinds of questions are possible in relation to the answer to the division: Meanings of arithmetic operations (division)ĭivision means splitting up into equal groups. Why?īefore considering the following explanation, refer to: For 5 0: first enter 5, then press, and finally enter 0.įor 5 0, the display should show "E" or "ERROR". Use your calculator now to do:Ĭalculator entry can also be an issue. Division by and division into zero can cause conceptual difficulties for students.
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