It’s 0. It can’t be null, as null isn’t a valid int value. From section 7.6.10.4 of the C# 5 specification: All elements of the new array instance are initialized to their default values (ยง5.2). And from section 5.2: The default value of a variable depends on the type of the variable and is determined … Read more
External and static variables are initialized to zero by default, this is guaranteed. Automatic and register variables that do not have en explicit initializer will have an indeterminate value (either an unspecified value or a trap representation). From The Standard: C89 6.5.7: If an object that has static storage duration is not initialized explicitly, it … Read more
import argparse parser = argparse.ArgumentParser() parser.add_argument(‘–example’, nargs=”?”, const=1, type=int) args = parser.parse_args() print(args) % test.py Namespace(example=None) % test.py –example Namespace(example=1) % test.py –example 2 Namespace(example=2) nargs=”?” means 0-or-1 arguments const=1 sets the default when there are 0 arguments type=int converts the argument to int If you want test.py to set example to 1 even if … Read more
This will work in SQL Server: ALTER TABLE Employee ADD CONSTRAINT DF_SomeName DEFAULT N’SANDNES’ FOR CityBorn;
You can’t create compile-time constants of object references. The only valid compile-time constant you can use is null, so change your code to this: public void DoSomething(int index, ushort[] array = null, bool thirdParam = true) And inside your method do this: array = array ?? new ushort[0]; (from comments) From C# 8 onwards you … Read more
Windows MySQL v5 throws an error but Linux and other versions only raise a warning. This needs to be fixed. WTF? Also see an attempt to fix this as bug #19498 in the MySQL Bugtracker: Bryce Nesbitt on April 4 2008 4:36pm: On MS Windows the “no DEFAULT” rule is an error, while on other … Read more
Enumerable.Repeat(true, 1000000).ToArray();
Your post is correct. Unfortunately, if you need to use an optional parameter at the very end of the parameter list, you have to specify everything up until that last parameter. Generally if you want to mix-and-match, you give them default values of ” or null, and don’t use them inside the function if they … Read more
It doesn’t work because it’s not supported The DEFAULT clause specifies a default value for a column. With one exception, the default value must be a constant; it cannot be a function or an expression. This means, for example, that you cannot set the default for a date column to be the value of a … Read more
In the first code sample, a is a main method local variable. Method local variables need to be initialized before using them. In the second code sample, a is class member variable, hence it will be initialized to the default value.