Slide1

Definite Assignment Rule

Let's take a look at the example given below in the C# Language; it has a main method having an unassigned variable named "price" but when we run this, a "compile-time error" is issued. Look at the image given below.

Slide 1 Downwards

Try to assign a value to the ariable price and look at the output, an error is issued. Look at the image below.

Slide 2

So, finally at the end we have the following points.

• A variable must be definitely assigned at each location where it's value is obtained.
• A variable must be definitely assigned at each location where it is passed as a reference parameter.
• All output parameters of a function member must be definitely assigned at each location where the function member returns.
• The "this" variable of a "struct-type" instance constructor must be definitely assigned at each location where that instance constructor returns.