Matlabtest2

Front 1

1. MATLAB keywords are colored green by the editor.

Back 1

1. False.

Comments are colored green; keywords that control execution are colored blue.

Front 2

2. Indentation is required in MATLAB to define code blocks.

Back 2

2. False.

The MATLAB editor inserts indentation only to clarify for the reader the flow of control in a script.

Front 3

3. It is possible that no code at all is executed by 'if' or 'switch' constructs.

Back 3

3. True.

If the if statement has no else clause, or the switch statement has no otherwise clause and the data provided matches none of the specified cases.

Front 4

4. The word 'true' is a valid logical expression.

Back 4

4. True.

Front 5

5. When evaluating a sequence of logical && expressions, MATLAB will stop processing when it finds the first true result.

Back 5

5. False.

The result that invalidates all other && expressions is false.

Front 6

6. The for loop repeats the enclosed code block a fixed number of times even if you modify the index variable within the code block.

Back 6

6. True.

But you can still use break to exit the loop early.

Front 7

7. Using a break statement is illegal in a while loop.

Back 7

7. False.

But it ought to be. This is really bad programming practice.

Front 8

8. The logical expression used in a while loop specifies the conditions for exiting the loop.

Back 8

8. False.

The expression specifies the reason to stay in the loop.

Front 9

1. MATLAB uses __________ in the text to define the extent of code blocks.

Back 9

1. key command words

Front 10

2. The function __________ is implicitly called by MATLAB if you supply a vector of logical values to the if statement.

Back 10

2. all(...)

Front 11

3. It is good practice to include __________ in a switch
statement to trap illegal values entering the switch.

Back 11

3. otherwise

Front 12

4. There is no reason to evaluate any more components of a logical or expression once a __________ result has been found.

Back 12

4. true

Front 13

5. A while loop can be repeated a ___________ number of times, depending on the ___________ being processed.

Back 13

5.
variable;
values of data

Front 14

6. If you are in a __________ loop, you can use the break
statement to skip immediately out of the __________ loop.

Back 14

6.
for or while;
innermost containing

Front 15

1. All data used by a function must be passed in as parameters to the function.

Back 15

1. False.

Functions have access to all the system data and functions, and can also reach global data directly.

Front 16

2. The name of the first function in an m-file must match the name of the file containing its definition.

Back 16

2. False.

Although this ought to be True. MATLAB calls user-defined functions by the name of the m-file, and ignores the name specified there.

Front 17

3. The first documentation line appears in the Current Directory listing.

Back 17

3. True.

Front 18

4. Functions must consume at least one parameter.

Back 18

4. False.

Functions can be defined with no parameters required.

Front 19

5. The calling code must provide assignments for every result returned from a function.

Back 19

5. False.

Any result for which a variable is not provided by the caller is ignored.

Front 20

6. The names of auxiliary functions must begin with local_.

Back 20

6. False.

This is merely a convention suggested to clarify the source of their definition.

Front 21

1. _________ permits a code block to be packaged and
referred to collectively rather than individually.

Back 21

1. Procedural abstraction

Front 22

2. Values of the __________ parameters are copied to define the __________ parameters inside the function.

Back 22

2.
actual;
formal

Front 23

3. If more than one result is to be returned from a function, they are defined in a __________ .

Back 23

3. vector-like container of variable names

Front 24

4. __________ describes the situation where the variables within a function are not visible from outside, and the function is unable to cause side effects by making assignments to outside variables.

Back 24

4. Local Scope

Front 25

5. Calling code can only reach the __________ function in an m-file. Other functions in the m-file can only be called from the __________ or ___________ .

Back 25

5.
first;
first function;
other auxiliary functions in the same file

Front 26

1. Casting changes the value of a piece of data.

Back 26

1. False.

Casting changes the way the computer views a piece of data without
changing it.

Front 27

2. The ASCII code maps individual characters to their internal numerical representation.

Back 27

2. True.

Front 28

3. Because the single quote mark ( ' ) delimits strings, you cannot use it within a string.

Back 28

3. False. It can be represented within a string by inserting two successive quote marks: (' ').

Front 29

4. If you attempt mathematical operations on a character string, MATLAB will throw an error.

Back 29

4. False.

MATLAB will automatically cast the string to its ASCII values first.

Front 30

5. The function disp(...) can display multiple values to the Command window.

Back 30

5. True.

But they have to be explicitly converted to characters and concatenated into one string.

Front 31

6. The function strcmp(...) throws an error if the two strings are of unequal length, unless one of them is a single character.

Back 31

6. False.

Unequal length strings are reported as not being equal.

Front 32

7. The switch statement will correctly compare strings of unequal length in the case tests.

Back 32

7. True.

Front 33

1. Numerical values are stored in MATLAB in ___________ for efficient numerical computation.

Back 33

1. a special internal representation

Front 34

2. Most common __________ , __________ , and many __________ are represented in ASCII by the numbers __________ .

Back 34

2.
characters;
numbers;
punctuation marks;
0–127

Front 35

3. The function __________ casts a string to a vector of the same length as the string containing the numerical mapping of __________.

Back 35

3.
uint8(...);
each letter

Front 36

4. The function fprintf(...) requires a ___________ that
defines exactly how the resulting string should be formatted and a variable number of __________.

Back 36

4.
format control string;
value parameters

Front 37

5. Since the __________ statement tests a logical expression, it ___________ test strings of unequal length.

Back 37

5.
if;
cannot

Front 38

6. A special version of the __________ cast function accepts strings with different lengths, ___________ , and stores them in an array of characters.

Back 38

6.
char(...);
pads them with blanks

Front 39

1. Of all the collective operations defined for numerical arrays, only logical operations can be applied to a whole cell array.

Back 39

1. False.

None of the collective operations defined for numerical arrays can be applied to cell arrays or structures.

Front 40

2. A cell array or a structure can contain any legal MATLAB object.

Back 40

2. True.

Front 41

3. You gain access to the contents of a cell by using braces, {...}.

Back 41

3. True.

Front 42

4. Since the contents of a structure are heterogeneous, we can store other structures in any structure.

Back 42

4. True.

Front 43

5. The statement rmfield(str, 'price') removes the field 'price' and its value from the structure str.

Back 43

5. False. It returns a new structure with the field and value removed.

Front 44

6. The statement getfield(str, <fldname>) returns the value of the specified field.

Back 44

6. True.

Front 45

7. You cannot extract and process all of the values of a field in a structure array.

Back 45

7. False.

If stra is a structure array with the field data, the expression {stra.data} will extract all the values into a cell array.

Front 46

1. To perform any operations on the contents of a heterogeneous collection, the items must be __________ and __________ if necessary.

Back 46

1.
extracted one at a time;
replaced

Front 47

2. Cell arrays can be treated for the purpose of concatenation and slicing as __________ of ___________ .

Back 47

2.
arrays;
containers

Front 48

3. The assignment B{3} = {42} results in the third entry in the cell array B to be a __________ .

Back 48

3. cell containing 42

Front 49

4. If a variable called field contains the value of a field of a structure str, the expression __________ will set the value of that field to 42.

Back 49

4. str.(field) = 42

Front 50

5. MATLAB has a built-in function __________ that
consumes pairs of entries, each consisting of a __________ and a __________ , and produces a structure array.

Back 50

5.
struct(...);
field name as a string;
cell array of field contents