Why doesn’t C# use arithmetic overflow checking by default? [duplicate]

The C# Language Specification says this: For non-constant expressions (expressions that are evaluated at run-time) that are not enclosed by any checked or unchecked operators or statements, the default overflow checking context is unchecked unless external factors (such as compiler switches and execution environment configuration) call for checked evaluation. The reason for this choice is … Read more

how do I get all checkbox variables even if not checked from HTML to PHP?

I just ran into this problem myself. I solved it by adding a duplicate hidden field with the same name. When the browser sends this information, the second field overrides the first (so ensure that the hidden field comes first). <input type=”hidden” name=”foo” value=””> <input type=”checkbox” name=”foo” value=”bar”> If the checkbox is not checked you … Read more

What is the difference between the states selected, checked and activated in Android?

The difference between Checked and Activated is actually quite interesting. Even the Google documentation is apologetic (emphasis below added): … For example, in a list view with single or multiple selection enabled, the views in the current selection set are activated. (Um, yeah, we are deeply sorry about the terminology here.) The activated state is … Read more