0.0/0.0 in C# won't throw "Attempted to divide by zero."?

Question

I've seen this finance calculation code at my friend's computer :

double Total = ...
double Paid = ...
double Wating_For_Details = ...
double Decuctibles = ...
double Rejected = ...

Well , the moment I saw this , I told him that double is represented at base 2 and can NOT represent finance calculation. use decimal instead.

great.

But the moment I change it to double Ive encountered :

Attempted to divide by zero.

HUH ?

Apparently - using double , when dividing with 0.0 it does NOT throws exception :

But returns NAN.

While my code (using decimal) does throw exception ( when Total is zero)

And so I ask :

I checked 0.0==0 and it returns true. so why I'm not getting exception but NAN? I know thats how it should be but where is the common sence of not throwing exception when dividing double by zero ?

Answer 1

Unlike operations with integral types, which throw exceptions in cases of overflow or illegal operations such as division by zero, operations with floating-point values do not throw exceptions. Instead, in exceptional situations, the result of a floating-point operation is zero, positive infinity, negative infinity, or not a number (NaN):

From Double on MSDN.