Midterm review

Question 1

Using Directive

Answer 1

• Using System
• tells the compiler where to look for a class that’s used in this app
• Each using directive identifies a namespace containing predefined classes that a C# app should be able to use

Question 2

White space

Answer 2

• space bar, tab, blank lines
• Ignored by the compiler
• make code easier to read

Question 3

Class Name Convention

Answer 3

• begin with a capital letter and capitalize the first letter of each word they include
• a series of characters consisting of letters, digits and underscores (_) that does not begin with a digit and does not contain spaces

Question 4

Write

Answer 4

• cursor stays on the same line of text in the console window

Question 5

WriteLine

Answer 5

• cursor moves to the next line of text in the console window

Question 6

escape sequence

Answer 6

• \n, \t, \r, ", \

Question 7

\n

Answer 7

• New line. Positions the screen cursor at the beginning of the next line

Question 8

\t

Answer 8

• Horizontal tab. Moves the screen cursor to the next tab stop

Question 9

\r

Answer 9

• Carriage return. Positions the screen cursor at the beginning of the current line—does not advance the cursor to the next line. Any characters output after the carriage return overwrite the characters previously output on that line.

Question 10

"

Answer 10

• Double quote. Used to place a double-quote character (“) in a string—e,g., Console.Write( “"in quotes"” ); displays “in quotes”.

Question 11

\

Answer 11

Backslash. Used to place a backslash character in a string.

Question 12

declare a class named “Addition”

Answer 12

public class Addition

Question 13

declare the main method

Answer 13

public static void Main(string [ ] args)
{

}

Question 14

declare “number1” as an integer data type

Answer 14

int number1;

Question 15

initialize number1 as an integer data type equal to 10

Answer 15

int number1 = 10;

Question 16

convert “number1” to an Integer data type

Answer 16

number1 = Convert.ToInt32( Console.ReadLine ( ) );

Question 17

Integer data types

Answer 17

• byte
• short
• int
• long

Question 18

floating point data types

Answer 18

• float
• double
• decimal

Question 19

char data type

Answer 19

• one character - “A”

Question 20

Bool data type

Answer 20

• true / false

- yes / no

Question 21

String data type

Answer 21

“my name is Krista”

Question 22

Simple data types

Answer 22

• int
• float
• char
• bool

Question 23

complex data type

Answer 23

string

Question 24

=

Answer 24

• assignment oppertator

- reads right side first

Question 25

Arithmetic Operators

Answer 25

• Addition ( + )
• Subtraction ( - )
• Multiplication ( * )
• Division ( / )
• Remainder ( % ) -> Modulas

Question 26

Relational Operators

Answer 26

> , =, <=

higher Precedence

Question 27

Equality Operators

Answer 27

== , !=

lower Precedence

Question 28

get accessors

Answer 28

• reading the values of a variable

Question 29

set accessors

Answer 29

• string values in a variable

Question 30

create a Gradebook object of a Gradebook class in another class

Answer 30

• Gradebook mygb = new Gradebook( );

Question 31

Call Gradebook’s DisplayMessage method

Answer 31

myGradebook.DisplayMessage( );

Question 32

new class all together

Answer 32

public class GradeBookTest
{

          public static void Main( string[] args )
{
         GradeBook myGradeBook = new GradeBook();

     myGradeBook.DisplayMessage(); }  }

Question 33

local variables

Answer 33

• Variables declared in the body of a method

- can be used only in that method

Question 34

instance variables

Answer 34

• When each object of a class maintains its own copy of an attribute
• each object (instance) of the class has a separate instance of the variable

Question 35

public property

Answer 35

public class gradebook

Question 36

constructor

Answer 36

• if you dont declare one it will automatically be assigned
• public GradeBook( string cname )
  {
  CourseName = cname;
  }

Question 37

constructor characteristics

Answer 37

• same name as class name
• no return type
• main method

Question 38

auto implemented property

Answer 38

public string CourseName { get; set; }

Question 39

selection

Answer 39

• if (one option)
• if / else (two options)
• switch (more than two options)

Question 40

looping

Answer 40

• while (counter and sentinel controlled)

- for

Question 41

counter

Answer 41

int counter = 1
While (Counter <= 22)
{
functions

counter = counter + 1
}

Question 42

if selection statement

Answer 42

if ( grade >= 60 )

Console.WriteLine( “Passed” );

Question 43

if / else double selection statement

Answer 43

if ( grade >= 60 )
Console.WriteLine( “Passed” );
else
Console.WriteLine( “Failed” );

Question 44

Conditional Operator

Answer 44

• an be used in place of an if / else statement

- Console.WriteLine( grade>=60 ? “Passed”:”Failed” );

Question 45

Nested if / else Statements

Answer 45

if ( grade >= 90 ) 
Console.WriteLine( "A" );
else if ( grade >= 80 ) 
Console.WriteLine( "B" );
else if ( grade >= 70 ) 
Console.WriteLine( "C" );
else if ( grade >= 60 ) 
Console.WriteLine( "D" );
else
Console.WriteLine( "F" );

Question 46

while loop

Answer 46

int product = 3;
while ( product <= 100 )
product = 3 * product;

Question 47

Arithmetic compound operators

Answer 47

counter = counter + 1

counter += 1

++ counter

counter ++

Question 48

increment operators

Answer 48

• prefix increment ( ++a )

- postfix increment ( a++ )

Question 49

decrement operators

Answer 49

• prefix decrement ( –a )

- postfix decrement ( a– )

Question 50

casting

Answer 50

double avg = (double) total / numofgrades

Question 51

for

Answer 51

for ( int counter = 1; counter <= 10; ++counter )
Console.Write( “{0} “, counter );

for ( initialization; loopContinuationCondition; increment ) statement

Question 52

while

Answer 52

initialization;
while ( loopContinuationCondition ) {
statement
increment; }

Question 53

switch

Answer 53

switch ( grade / 10 )
{ 
case 9:
case 10: 
\++aCount;
break;
case 8:
\++bCount;
break;
...
default:
\++fCount;
break;
}

Question 54

continue statement

Answer 54

skips the remaining statements in the loop body and proceeds with the next iteration of the loop.

Question 55

Logical Operators

Answer 55

• enable you to form more complex conditions by combining simple conditions
• The logical operators are && (conditional AND), || (conditional OR), & (boolean logical AND), | (boolean logical inclusive OR), ^ (boolean logical exclusive OR) and ! (logical negation)

Question 56

syntax error

Answer 56

• user typed something in wrong

Question 57

logical error

Answer 57

• compiler will not catch it, but the code will not run correctly

Question 58

run time error

Answer 58

• the user typed something in wrong

Question 59

system

Answer 59

• namespace in the .Net library

Question 60

class

Answer 60

a definition of things (blueprint)

Question 61

format specifier

Answer 61

{ 0:F } - round to two decimal places

{ 0:C } - formats as currency

Question 62

static

Answer 62

the code can run even with no object