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Calculators mostly have a microcontroller for processing , a microcontroller usually is consisted of it's own processing unit , ROM , FLASH memory and I/O ports to deal with other components like keypad or LCD , microprocessors usually have families for different sorts of applications , some examples of the very famous microcontroller vendors are ATMEL and Microchip , every vendor has it's own instruction set for every micocontroller.Computers mostly have a microprocessor as a processing unit , a microprocessor needs an external RAM , BIOS and different I/Os to boot , It is more complicated than a microcontroller in terms of architecture , it has more complex instruction set and a lot of algorithms are implemented inside it to improve it's performance , some of these algorithmic architectures are Pipe-lining and Register Caching. Some examples of the very famous microprocessor vendors are AMD , ATMEL , IBM , ARM (the smartphone processor) and the most famous Intel.
Structure can not be assigned null value.
in vb.net you do something like
Dim d As DateTime = Nothing
But all this does is to set d to the default DateTime value.
In C# the equivalent code would be this:
DateTime d = default(DateTime);
...which is equivalent to DateTime.MinValue.
so in background it is never assigned as null
DateTime is a Value Type like int, double etc. so there is no way to assigned a null value.
You can solve this problem in two ways, either make it a nullable type, or use the System.DateTime.MinValue.
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