Deck 3: Expressions and Interactivity

Question 1

This function tells the cin object to skip one or more characters in the keyboard buffer.

A)cin.ignore
B)cin.jump
C)cin.hop
D)cin.skip;
E)None of the above

Answer 1

cin.ignore

Question 2

The ________ operator always follows the cin object, and the ________ operator follows the cout object.

A)binary, unary
B)conditional, binary
C)>>, <<
D)<<, >>
E)None of the above

Answer 2

>>, <<

Question 3

When the final value of an expression is assigned to a variable, it will be converted to:

A)The smallest C++ data type
B)The largest C++ data type
C)The data type of the variable
D)The data type of the expression
E)None of the above

Answer 3

The data type of the variable

Question 4

This statement will pause the screen, until the [Enter] key is pressed.

A)
B)
C)
D)
E)

Question 5

To use the rand()function, you must #include this header file in your program.

A)iostream
B)iomanip
C)iorand
D)cstdlib
E)None of these

Question 6

When this operator is used with string operands it concatenates them, or joins them together.

A)&
B)*
C)%
D)+
E)None of the above

Question 7

Which statement will read an entire line of input into the following string object?
String address;

A)cin << address;
B)cin address;
C)getline(cin, address);
D)cin.get(address);
E)None of the above

Question 8

You can use these to override the rules of operator precedence in a mathematical expression.

A)[Brackets]
B)(Parentheses)
C){Braces}
D)The escape character \
E)None of these

Question 9

Associativity is either right to left or:

A)Top to bottom
B)Front to back
C)Left to right
D)Undeterminable
E)None of the above

Question 10

When a variable is assigned a number that is too large for its data type, it:

A)underflows
B)overflows
C)reverses polarity
D)exceeds expectations
E)None of the above

Question 11

The ________ causes a program to wait until information is typed at the keyboard and the Enter key is pressed.

A)Output stream
B)
C)
D)Preprocessor
E)None of the above

Question 12

In the following C++ statement, what will be executed first according to the order of precedence?

A)6 - 3
B)3 * 2
C)2 + 7
D)7 - 10
E)10 / 2

Question 13

Assume that x is an int variable. What value is assigned to x after the following assignment statement is executed?

A)0
B)1
C)2
D)-3
E)None of these

Question 14

What is the value stored at x, given the statements:

A).3
B)0
C).275229
D)3.3
E)None of these

Question 15

This manipulator is used to establish a field width for the value immediately following it.

A)field_width
B)set_field
C)setw
D)iomanip
E)None of the above

Question 16

You want the user to enter the length, width, and height from the keyboard. Which cin statement is correctly written?

A)
B)
C)
D)
E)

Question 17

In any program that uses the cin object, you must include the ________.

A)compiler
B)iostream header file
C)linker
D)>> and << operators
E)None of the above

Question 18

The function, pow(x, 5.0), requires this header file.

A)cstdlib
B)cmath
C)cstring
D)iostream
E)iomanip

Question 19

This manipulator causes the field to be left-justified with padding spaces printed to the right.

A)left_justify
B)right
C)left
D)left_pad
E)None of these

Question 20

________ reads a line of input, including leading and embedded spaces, and stores it in a string object.

A)cin.get
B)getline
C)cin.getline
D)get
E)None of these

Question 21

Which statement is equivalent to the following?
Number += 1;

A)number = number + 1;
B)number + 1;
C)number = 1;
D)None of these

Question 22

Which line in the following program will cause a compiler error?

A)6
B)8
C)9
D)7

Question 23

What is the value of number after the following statements execute?

A)3
B)30
C)39
D)2

Question 24

Which line in the following program will cause a compiler error?

A)6
B)8
C)9
D)7

Question 25

The total number of digits that appear before and after the decimal point is sometimes referred to as:

A)floating points
B)significant digits
C)precision
D)B and C
E)None of these

Question 26

When C++ is working with an operator, it strives to convert the operands to the same type.

Question 27

This stream manipulator forces cout to print the digits in fixed-point notation.

A)setprecision(2)
B)setw(2)
C)fixed
D)setfixed(2)
E)None of these

Question 28

When converting some algebraic expressions to C++, you may need to insert ________ that do not appear in the algebraic expression.

A)Parentheses
B)Exponents
C)Calculations
D)Coercions
E)None of the above

Question 29

When using the sqrt function you must include this header file.

A)cstdlib
B)cmath
C)cstring
D)iostream
E)iomanip

Question 30

When the fixed manipulator is used, the value specified by the setprecision manipulator will be the number of digits to appear after the decimal point.

Question 31

What is the value of average after the following code executes?

A)2.0
B)4.0
C)1.5
D)6.0

Question 32

The cin << statement will stop reading input when it encounters a newline character.

Question 33

The only difference between the get function and the >> operator is that get reads the first character typed, even if it is a space, tab, or the [Enter] key.

Question 34

What will the value of result be after the following statement executes?

A)8
B)6
C)1.5
D)2

Question 35

The statement:

Will read up to this many characters into str.

A)Nine
B)Ten
C)Eleven
D)Eight
E)None of these

Question 36

Arithmetic operators that share the same precedence have right to left associativity.

Question 37

Which is true about the following statement?

A)It allows four spaces for the value in the variable num4.
B)It outputs "setw(4)" before the value in the variable num4.
C)It should use setw(10)to output the value in the variable num10.
D)It inputs up to four characters stored in the variable num4.
E)None of these

Question 38

Which statement is equivalent to the following?
X = x * 2;

A)x * 2;
B)x *= 2;
C)x = x * x;
D)None of these

Question 39

What will the value of x be after the following statements execute?

A)13
B)18
C)0
D)unknown

Question 40

If you want to know the length of the string that is stored in a string object, you can call the object's size member function.

Question 41

The following statement will output $5.00 to the screen:
cout << setprecision(5)<< dollars << endl;

Question 42

The fixed manipulator causes a number to be displayed in scientific notation.

Question 43

In C++, it is impossible to display the number 34.789 in a field of 9 spaces with 2 decimal places of precision.

Question 44

When a program uses the setw manipulator, the iosetwidth header file must be included in a preprocessor directive.