CSF2 Flashcards
What are characteristics of the datatype DateTime?
- it’s a datatype from the FCL (framework class library)
- used to create variables that hold date and time info
- time defaults to 12am
- it’s a complex data type, unlike strings, ints, etc…which are all intrinsic data types
What does a complex datatype need?
Complex data types often need the NEW keyword and
a constructor method, which has the same name as the data type.
What’s the syntax for DateTime?
…and what format specificers can be used with DateTime?
DateTime x= new DateTime();
You can use format specificers on DateTime.
(t, T, d, D, f, F)
How do you explore an object with intellisense?
…using a period
How do you determine the current date?
DateTime.Today
How do you determine the current date AND time?
DateTime.Now
How do you explore a method with intellisense?
Use an open paren (
Random myRandomNbr = new Random();
int myNextRandomNbr = myRandomNbr.Next(5, 11);
Console.WriteLine(“Number between 5-10: “ +
myNextRandomNbr);
Is Random a complex or instrinsic data type?
**is a complex and requires a the NEW keyword **
What’s happening here…
** int nbr0and20 = randomNbrGen.Next(21);
Console.WriteLine(“A number between 0-20 is “+ nbr0and20);**
a random number is output less than 21
What’s this doing…
** int Nbr50and105 = randomNbrGen.Next(50, 106);
Console.WriteLine(“A number between 50-105 is “ + Nbr50and105);**
How are METHODS OUTSIDE the class, but INSIDE the project, called?
ClassName.MethodName
How is the console cleared?
Console.Clear();
bool exit = false; //COUNTER
do
{
Console.WriteLine("\nPlease choose a program\n"
\+ "(B) Break Change\n"
\+ "(W) Water Weight\n"
\+ "(N) Numbers\n"
\+ "(T) Display Time\n"
\+ "(C) Calendar App\n"
\+ "(X) Exit");
string choice = Console.ReadLine().ToUpper();
Console.Clear();
switch (choice)
{
case "B":
Console.WriteLine("Break Change");
BreakChange();
break;
case "W":
Console.WriteLine("Water Weight");
WaterWeight();
break;
case "N":
Console.WriteLine("Numbers");
CountNumbers();
break;
case "T":
Console.WriteLine("Display Time");
DateTimeWarehouse.DisplayTime();
break;
case "C":
Console.WriteLine("Calendar App");
Console.WriteLine(“Please type a number of days from today to display”);
int userDays = int.Parse(Console.ReadLine()); DateTime newDate = DateTimeWarehouse.CalculateDate(userDays);
DateTimeWarehouse.DisplayTime(newDate);
break;
case "X":
Console.WriteLine("Thank you for using the program");
exit = true;
break;
default:
Console.WriteLine("Input not recognized. Please try again.");
break;
}//end switch
} while (!exit);
bool exit = false; //COUNTER
do
{
//print menu
Console.WriteLine("\nPlease choose a program\n"
\+ "(B) Break Change\n"
\+ "(W) Water Weight\n"
\+ "(N) Numbers\n"
\+ "(T) Display Time\n"
\+ "(C) Calendar App\n"
\+ "(X) Exit");
string choice = Console.ReadLine().ToUpper();
Console.Clear();//clears the console of the previous display
//BEST USED AFTER ReadLine() don't do this BEFORE or they
//will never see the menu...
switch (choice)
{
case "B":
Console.WriteLine("Break Change");
BreakChange();
break;
case "W":
Console.WriteLine("Water Weight");
WaterWeight();
break;
case "N":
Console.WriteLine("Numbers");
CountNumbers();
break;
case "T":
Console.WriteLine("Display Time");
DateTimeWarehouse.DisplayTime();
break;
case "C":
Console.WriteLine("Calendar App");
//print out today's date for now, we will come
//back and figure out a calculated date next
//DateTimeWarehouse.DisplayTime(DateTime.Now);
Console.WriteLine("Please type a number of days from today to display");
int userDays = int.Parse(Console.ReadLine());
//ask the user for a number of days
//use the calculate date method
DateTime newDate = DateTimeWarehouse.CalculateDate(userDays);
//print the calculated date with our custom format
DateTimeWarehouse.DisplayTime(newDate);
break;
case "X":
Console.WriteLine("Thank you for using the program");
exit = true;
break;
default:
Console.WriteLine("Input not recognized. Please try again.");
break;
}//end switch
//} while (exit == false); //revere logic
} while (!exit); //see !...think not since the CONDITION needs a TRUE statement
//the ! merely states that it should look for a NOT TRUE
What is Random?
** Random is a class in the FCL
(Framework Class Library).
* It has an instance method, Next() which generates the “next”
* random number in a desired range if specified.**
What is the difference between a static method and an instance method?
???
