Deck 3: Expressions and Interactivity

Question 1

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

A) cin;
B) cin.getline();
C) cin.get();
D) cin.ignore();
E) cin.input();

Answer 1

C

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

C

Question 3

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

Answer 3

C

Question 4

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

Question 5

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 6

What is the value stored at x, given the statements: int x;
X = 3 / static_cast(4.5 + 6.4);

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

Question 7

In the following C++ statement, what will be executed first according to the order of precedence? result = 6 - 3 * 2 + 7 - 10 / 2 ;

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

Question 8

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 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

___________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 11

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 12

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 13

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 14

Assume that x is an int variable. What value is assigned to x after the following assignment statement is executed? x = -3 + 4 % 6 / 5;

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

Question 15

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

A) cin << length, width, height;
B) cin.get(length, width, height);
C) cin >> length >> width >> height;
D) cin >> length, width, height;
E) cin << length; width; height;

Question 16

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

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

Question 17

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

Question 18

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 19

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

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

Question 20

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 21

The statement cin >> setw(10) >> str;
Will read up to this many characters into str.

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

Question 22

Which line in the following program will cause a compiler error? 1 #include
2 using namespace std;
3
4 int main()
5 {
6 const int MY_VAL;
7 MY_VAL = 77;
8 cout << MY_VAL << endl;
9 return 0;
10 }

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

Question 23

What is the value of number after the following statements execute? int number = 10;
Number += 5;
Number -= 2;
Number *= 3;

A) 3
B) 30
C) 15
D) 2

Question 24

Which is true about the following statement? cout << setw(4) << num4 << " ";

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 25

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

Question 26

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 27

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

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

Question 28

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 29

What will the value of result be after the following statement executes? result = 6 - 3 * 2 + 7 - 10 / 2 ;

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

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

Which line in the following program will cause a compiler error? 1 #include
2 using namespace std;
3
4 int main()
5 {
6 const int MY_VAL = 77;
7 MY_VAL = 99;
8 cout << MY_VAL << endl;
9 return 0;
10 }

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

Question 32

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

Question 33

What is the value of average after the following code executes? double average;
Average = 1.0 + 2.0 + 3.0 / 3.0;

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

Question 34

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 35

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 36

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

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

Question 37

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

Question 38

What will the value of x be after the following statements execute? int x = 0;
Int y = 5;
Int z = 4;
X = y + z * 2;

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

Question 39

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 40

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 41

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

Question 42

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

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

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