Advanced C++ Tutorials 1 : Vectors & Physics : Convert Polar to Cartesian


A helpful way to learn c++, and to understand how to program physics in programming. Part 1 of this tutorials goes over the setup of the vector class, and we make a function for converting polar coords, to cartesian.

Valid styles for converting datetime to string

I wrote this little table and procedure to help me remember what style 104 did, or how to get HH:MM AM/PM out of a DATETIME column. Basically, it populates a table with the valid style numbers, then loops through those, and produces the result (and the syntax for producing that result) for each style, given the current date and time.

It uses also a cursor. This is designed to be a helper function, not something you would use as part of a production environment, so I don’t think the performance implications should be a big concern.

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Use CAST (or CONVERT) to handle Null Date values in Microsoft SQL Server

In an SQL Server View, a problem is that the DateTime field has many Null values which is causing a problem with the parsing of the data in MSAccess.

How to I use CAST (or CONVERT) to handle Null Date values in my SQL Server view?

There is a way to use CAST or CONVERT similar to the nz type function in MSAccess to handle null date values but I can’t remember the syntax.

What is happening now is that I get a data mismatch in my MSAccess function when it hits a Null Date value. Can I somehow use the ISNULL or ISDate function? I believe I need to somehow return “” instead of Null.

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