Division by zero

Question

Hello! I use the same library with CodePlex, but why doesn’t an error or exception occur in the code below?

var speed = 13.9 * 1000 / TimerPeriod * (ts.Seconds + ts.Milliseconds / 1000.0); sel_probe.SegmentLength = 0; var proportion = speed / sel_probe.SegmentLength; // proportion вычисляется, но откуда?

@alexlz, there is such a rule in mathematics that it is impossible to divide by zero.
In this case, it’s interesting not the output value, but the properties of the compiler ...
@Asen Ecma-334 C # Language Specification 11.1.6 Floating point types

Maxim Kamalov Maxim Kamalov 1.407 9 22 · Accepted Answer · 2012-03-24T08:59:37

Perhaps, SegmentLength, when trying to write 0 there, silently writes some non-zero default value.

angry 5,860 15 57 171 · Answer 2 · 2012-03-24T11:15:42

Try putting a breakpoint on the line.

 var proportion = speed / sel_probe.SegmentLength;

Open the watch window and look at the value of expressions in it:

 speed sel_probe.SegmentLength speed / sel_probe.SegmentLength

At the same time find out what type the variable speed has :)

Sergey Teplyakov Sergey Teplyakov 5,767 23 35 · Answer 3 · 2016-08-25T21:27:18

And something seems to me that everything is much simpler. What is the expected behavior in this case:

 double d = 0; var r = 42/d;

DivideByZeroException ? Well then, I'll disappoint you, the result is Infinity , not an exception.

The variable speed is of type double , and it can be divided by 0 "can" in the sense that there will be no exception.

angry 5,860 15 57 171 · Answer 4 · 2012-03-24T08:59:11

Whether sel_probe.SegmentLength is sel_probe.SegmentLength value of "0", most likely the class uses a method that does not allow having / returning a value of 0 for SegmentLength .

Yes, I did not take into account that the assignment operator cannot be overloaded in C #.

Division by zero

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