H1-3 Flashcards
Convert to other type
System.Convert.To…(value)
[struct] do you always get default values?
No, only when using new, calls the constructor
[struct] how many parameters go in the constructor?
All fields otherwise compile exception.
[Optional] what is a restriction with optional parameters?
(Par1 = 1, Par2 = 2), can’t do (Par2 only) because then you need to do Par1 also.
How can you call parameters by name
(parameter1 : value, parameter2 : value)
give an example of a for loop with empty definitions
for(;;)
{
if(xxxx) break;
}
what is an indexed property?
public class IPAddress
{
private int[] ip;
public int this[int index]
{
get
{
return ip[index];
}
set
{
if (value == 0 || value == 1)
ip[index] = value;
else
throw new Exception("Invalid value");
}
}
}How do you use an indexed property
IPAddress myIP = new IPAddress();
// initialize the IP address to all zeros
for (int i = 0; i < 32; i++)
{
myIP[i] = 0;
}give an example of a generic queue class
// example of a generic style Queue
public class GenericQueue{T}
{
public void Enqueue(T obj);
public T DeQueue();
}Give an example of a generic methode.
// example of generic method with type parameters
public void Swap{T}(T valueOne, T valueTwo)
{
T temp = valueOne;
valueOne = valueTwo;
valueTwo = temp;
}give an example of an enumeration in code
enum Months {Jan, Feb, March, …}
give an example of an enumuration that is not an int
enum Months : byte {Jan, Feb, …}
give an example of an enumeration that starts with 4 and not the default 0.
enum Months {Jan = 1, Feb, … }
Give an example of an extention methode
public static class MyExtendedMethods
{
public static int square(this int num)
{
int result = 0;
result = num * num;
return result;
}
}How many indexed properties can a class have?
One.
