SPF Review 1

1	What is MSIL and what advantage does it bring to programming?
	MSIL is Microsoft Intermediate Language (now it has been renamed as CIL (Common Intermediate Language). Advantage: allow different .NET languages code to work together
2	What is the main purpose of the keyword namespace?
	A namespace is a way to group related code/classes together
3a	Declare an Integer type variable with appropriate name to indicate that it is to be used to store number of student in a class. Initialise it with a value of 27:
	int numberOfStudent = 27;
3b	Declare an accurate Decimal type variable with appropriate name to indicate that it is to be used to store the size of the spaceship exit height. Initialise it with a value of 150.0:
	double sizeSpaceshipExitHeight = 150.0;
3c	Declare a true/false type variable with appropriate name to indicate whether it is raining now. Initialise it with a value of true:
	bool raining = true;
3d	Declare a Character type variable with appropriate name to indicate that it is the NRIC type. Initialise it with a value of T:
	char NricType = 'T';
3e	Declare a String type variable with appropriate name to indicate that it is the email of the user. Initialise it with a value of noname@example.com:
	string userEmail =  “noname@example.com”;

4	You may use the Visual Studio to try out the following console program:
	In the main method: int x, y, result; float floatresult; x = 7; y = 5; result = x+y; Console.WriteLine("x+y: {0}", result); result = x-y; Console.WriteLine("x-y: {0}", result); result = x*y; Console.WriteLine("x*y: {0}", result); result = x/y; Console.WriteLine("x/y: {0}", result); floatresult = (float)x/(float)y; // ** Line A ** Console.WriteLine("x/y: {0}", floatresult); result = x%y; Console.WriteLine("x%y: {0}", result); result += x; Console.WriteLine("result+=x: {0}", result);

a)	Write down the program output below :
	x+y: 12
	x-y: 2
	x*y: 35
	x/y: 1
	x/y: 1.4
	x%y: 2
	result+=x: 9
b)	Explain the “(float)” used in Line A. What happen if it is not used?
	Explicit casting => convert x from integer to float, convert y from integer to float.  If it is not used, then x/y will give the result in integer and the decimal portion will be lost.