c# - Use of an unassigned local variable (double)

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65931423/use-of-an-unassigned-local-variable-double

Answer 1

In C#, the use of uninitialized variables is not allowed. If you do not assign a default value, or use a constructor, the compiler won't know what your value is and therefore cannot use it.

You need to change double a for double varName; or double varName = new double();. The new double() operation will set the default value to zero, according to this default value table. However, = 0 is the preferred syntax.