Deck 2: Data Types and Expressions

Question 1

The result of 25 % 4 is 6.25.

Answer 1

False

Question 2

Classes are actually implemented through types in C#.

Answer 2

False

Question 3

The symbols +=,-=,and *=,compound operators in C#,are used to provide a shortcut way to write assignment statements using the result as part of the computation.

Answer 3

True

Question 4

Placing the two plus symbols (++)before an identifier causes one to be added to the memory location referenced by the variable prior to any other statement's execution.

Question 5

The assignment operators (=,+=,-=,*=,and /=)represent operations that appear at the top of the hierarchy in the order of operations.

Question 6

The bool data type can take on values of true/false or on/off.

Question 7

The float compile-time initialization above will produce an error because it is missing the type specifier (f or F).

Question 8

An error will be produced when moreData is assigned the boolean variable shown above because the keyword true should be enclosed in double quotation marks.

Question 9

An appropriate identifier used to store the total transaction amount is total$Amount.

Question 10

Constants are normally named using all lowercase characters,separating second and subsequent words with the underscore character.

Question 11

The decimal equivalent for 3.42e-5 in scientific notation is .00342.

Question 12

An int variable would be the most appropriate type for a memory location that will be used to store the monthly membership dues for the computer club.

Question 13

In order to do a compile-time initialization of a decimal type,it is necessary to add a d or D onto the end of the value.

Question 14

The result of "123" + "321" is "123321".

Question 15

If aNumber is declared to be of type int with a value of 50,Console.out.WriteLine( aNumber++);displays 51.

Question 16

The decimal value type is appropriate for storing monetary data items because it provides for greater precision.

Question 17

Both static and constant are keywords in C#.

Question 18

Classes,methods,namespaces,and properties follow the Pascal case naming convention,which indicates that the first letter in the identifier is in lowercase and the first letter of each subsequent concatenated word is capitalized.

Question 19

C# allows you to mix numeric integral types and floating-point types in an expression.

Question 20

When you desk check the algorithm,you can compare the results obtained from the program with calculator results.

Question 21

One convention used for naming identifiers is called Pascal case. This convention requires that ____.

A) the first letter be lowercase with the first letter of each subsequent word capitalized
B) all letters appear in uppercase characters
C) the first letter be uppercase with the first letter of each subsequent word capitalized
D) all letters appear in lowercase with words separated by an underscore

Question 22

The binary value for ten is 00001010.

Question 23

The number 11111111 in binary is equivalent to the number 255 in decimal.

Question 24

Which statement subtracts 100 from the original value of an answer?

A) 100 -= answer;
B) answer = 100 -;
C) answer =- 100;
D) answer -= 100;

Question 25

The value $78,888.90 is printed as output when the {0:c)format specifier is used in the following Write statement: Console.Write("{0:c}",78888.894);

Question 26

With only eight bits,you can represent 2? or 256 different decimal values.

Question 27

The special character that can be used with an identifier is ____.

A) -
B) _
C) *
D) #

Question 28

Unicode includes representation of 2? or 256 unique characters.

Question 29

Given the following declarations,what is stored in ans as a result of the arithmetic expression? int ans = 0,v1 = 5,v2 = 8;
Ans = v2 % v1++;

A) 1.3333
B) 1.6
C) 2
D) 3

Question 30

Which of the following formats the first argument to display an amount with two digits to the right of the decimal?

A) {0:C}
B) {0:c}
C) {0:f2}
D) all of the above

Question 31

The value true could be stored in a variable of ____ type.

A) bool
B) decimal
C) char
D) floating point

Question 32

Base 16,also called the octal numbering system,uses powers of sixteen.

Question 33

The base-2 number system is also called the binary number system.

Question 34

Which of the following is a valid identifier?

A) score#1
B) amount owed by student
C) finalGrade
D) 4thExam

Question 35

When you think about a machine that has 60 gigabytes of hard disk space,you can store 60 million characters.

Question 36

The number 3.45 is an example of a(n)____ type.

A) bool
B) int
C) floating point
D) char

Question 37

Probably the most important rule for naming identifiers is ____.

A) do not use over 12 characters for the identifier
B) number the identifiers and begin each identifier with an numeric character representing its number
C) use a lowercase character for the first character of the identifier
D) be descriptive and select a meaningful name

Question 38

What is stored in ans as a result of the arithmetic expression,given the following declarations? int ans = 5,v1 = 2,v2 = 10,v3 = 18;
Ans += v1 + 10 * (v2-- / 5)+ v3 / v2;

A) 27
B) 12
C) 29
D) none of the above

Question 39

Hexadecimal uses the symbols 1,2,3,4,5,6,7 8,9,A,B,C,D,E,F ,G.

Question 40

A machine that has a 64-bit processor can process 64 characters at one time.

Question 41

The Hexadecimal numbering system uses all of the following symbols EXCEPT _____.

A) 0
B) A
C) F
D) H

Question 42

Which of the following integral type can NOT be used to store negative values?

A) sbyte
B) long
C) int
D) uint

Question 43

What would be stored in answer after the following arithmetic expression involving only integers,if the sign of the dividend is negative? int answer = -19 % -4;

A) -3
B) 3
C) 4.75
D) -4.75

Question 44

Another way to write the following expression is ____. ans *= v1 - 1;

A) ans = v1 * ans - 1;
B) ans = v1 * (ans - 1);
C) ans = ans * v1--;
D) ans = ans * --v1;

Question 45

In order to format the first argument in the WriteLine method so that it prints the value 5343.67 as $5,343.67 with a comma and a dollar symbol,you would insert the following format string as the argument to the WriteLine( )____.

A) "{0:$,2}"
B) "{C :0}"
C) "{0:C}"
D) "{0:F,2,$}"

Question 46

For a mixed expression equation involving an integer and a double,the result is a(n)____.

A) error
B) double
C) int
D) float

Question 47

A variable of type bool can store ____.

A) "true"
B) TRUE
C) true
D) all of the above

Question 48

The result of the following expression is ____. double ans,v1 = 45.7,v2 = 10.5;
Int v3 = 5;
Ans = (int)v1 + v2 / (double)v3;

A) 48.8
B) 47.1
C) 48
D) 47

Question 49

If you expect to receive an "A" in this course,which of the following declarations would be most appropriate for storing the grade?

A) char letterGrade;
B) string grade;
C) int letterGrade;
D) double letterGrade;

Question 50

The value stored in answer after the following expression is evaluated is int v1 = 10,v2 = 5,ans =3;
Ans += --v1 * v2++;

A) 39
B) 48
C) 57
D) none of the above

Question 51

A valid string literal representing the last month of the year is ____.

A) 12
B) "December"
C) lastMonthOfTheYear
D) December

Question 52

The decimal equivalent of 00011111 is ____.

A) 5
B) 10
C) 31
D) 32

Question 53

Which of the following expressions would be evaluated first? ans += v1 + v2 * v3 % 2;

A) ans += v1
B) v1 + v2
C) v2 * v3
D) v3 % 2

Question 54

Following standard conventions used by many programmers,the identifier REBATE would be defined as a(n)____.

A) class
B) object
C) namespace
D) constant

Question 55

Which of the following is a valid compile-time initialization for amountDue,a variable of the decimal type,that will initially be set to zero?

A) amountDue = 0;
B) amountDue = '0';
C) amountDue = 0m;
D) amountDue = 0d;

Question 56

A computer that has 8 GB of RAM can store approximately eight ____ characters.

A) million
B) trillion
C) gillion
D) billion

Question 57

Which of the following would be the most appropriate identifier for a memory location that will store the amount of rainfall for a given period of time?

A) time
B) amount of rain
C) amountOfRain
D) amountofrainforsomeperiodoftime

Question 58

Which of the following is a valid compile-time initialization for amountDue,a floating point variable of the double type,that will initially be set to zero?

A) amountDue = 0;
B) amountDue = '0';
C) amountDue = 0m;
D) amountDue = 0f;

Question 59

The binary equivalent of 24 is ____.

A) 00000011
B) 11000000
C) 00011000
D) 00001111

Question 60

The value 3.42e-4 is equivalent to _____.

A) 3420000
B) .000342
C) -3.420000
D) -.000342

Question 61

A(n)____________ represents an area in the computer memory where a value of a particular data type can be stored.When you declare a(n)____________,you allocate memory for that data item in your program.

Question 62

The ____________ data type is a whole number,between a certain range of values,and contains no decimal point.

Question 63

____________ are predefined reserved identifiers that have special meanings to the compiler.

Question 64

The ____________ data type was added to the language to eliminate the problems of loss of precision in mathematical operations that occurred in previous languages.

Question 65

When you add the keyword ____________ to a declaration,it becomes a constant.

Question 66

The C# category of ____________ operators appear at the top of the precedence table with the order of operations.

Question 67

____________ is the universal character-encoding schema that provides a unique number for every character in many different languages.

Question 68

____________ operators provide a shortcut way to write assignment statements using the result as part of the computation.

Question 69

____________ makes a variable temporarily behave as if it is a different type.

Question 70

The ____________ is sometimes referred to as the remainder operator.

Question 71

In order to place a value in memory that cannot be changed,you add the keyword ____________ to the declaration.

Question 72

One of the rules for creating a(n)____________ is to use a combination of alphabetic characters,numeric digits and the underscore character.

Question 73

A megabyte is approximately a(n)____________ bytes.

Question 74

Every time you declare a variable in the C# language,you are actually ____________ a class.

Question 75

The @ symbol in the following string,@ "C :\MyProjects",is called a(n)____________ character.