Matlab Input & Output Quiz

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35 practical questions on interacting with users via the command window, including input, disp, and formatted output with fprintf.

35 Questions

~70 minutes

Question 1

Which command prompts the user to enter a number and stores it in variable 'x'?

x = input('Enter a number: ');

x = get('Enter a number: ');

x = read('Enter a number: ');

input(x, 'Enter a number: ');

Question 2

How do you display the text 'Hello World' in the Command Window without the variable name?

disp('Hello World')

print('Hello World')

show('Hello World')

'Hello World'

Question 3

Which `fprintf` specifier is used to print a floating-point number?

Question 4

How do you request a *string* input from the user?

name = input('Enter name: ', 's');

name = input('Enter name: ');

name = inputString('Enter name: ');

name = raw_input('Enter name: ');

Question 5

What does the escape character '\n' do in `fprintf`?

Inserts a new line

Inserts a null character

Inserts a number

Nothing, it prints \n

Question 6

What is the output of `fprintf('Value: %d', 5.7)`?

Value: 5.700000

Value: 5.7e+00

Value: 5

Value: 5.7

Question 7

How do you combine the string 'Age: ' and the number 25 into a single displayed string?

disp(['Age: ' num2str(25)])

disp('Age: ' + 25)

disp('Age: ', 25)

disp('Age: ' & 25)

Question 8

What happens if the user presses Enter without typing anything for `x = input('Val: ')`?

x becomes an empty matrix []

x becomes 0

x becomes NaN

MATLAB waits indefinitely

Question 9

Which format specifier limits a floating point number to 2 decimal places?

%.2f

%2f

%f.2

%.2d

Question 10

What is the difference between `disp` and `fprintf`?

`disp` adds a newline automatically; `fprintf` does not

`fprintf` adds a newline automatically; `disp` does not

`disp` can format numbers; `fprintf` cannot

They are identical

Question 11

How do you print a literal percent sign '%' using `fprintf`?

pct

Question 12

If `name = 'Alice'`, what does `fprintf('Hello %s', name)` output?

Hello Alice

Hello 'Alice'

Hello name

Error

Question 13

Which function converts a number to a string for use in `disp`?

num2str

str2num

to_string

char

Question 14

What does the command `pause` do?

Stops execution until the user presses a key

Stops execution forever

Clears the screen

Skips the next line

Question 15

How do you display a matrix `A` nicely in the Command Window?

disp(A)

fprintf(A)

show(A)

echo(A)

Question 16

What is the result of `input('Prompt')` if the user types `pi`?

The numeric value 3.1416...

The string 'pi'

Error

NaN

Question 17

Which specifier prints a number in exponential notation (e.g., 1.2e+05)?

Question 18

How do you print a backslash character `` using `fprintf`?

Question 19

What does `int2str(10)` return?

The string '10'

The number 10

The integer 10

Error

Question 20

Can `fprintf` write to a file instead of the screen?

Yes, if you provide a file ID as the first argument

No, it is only for the console

Yes, using `fprintf('filename', ...)`

Only using `save`

Question 21

What happens if you use `disp` with multiple arguments, like `disp(a, b)`?

Error: Too many input arguments

It displays both

It displays the first one

It concatenates them

Question 22

Which command clears the Command Window text but keeps variables in the workspace?

clc

clear

clf

home

Question 23

What is the result of `sprintf('Val: %d', 10)`?

It returns the string 'Val: 10' but does not print it

It prints 'Val: 10' to the screen

It saves to a file

Error

Question 24

How do you align text in columns using `fprintf`?

Use width specifiers like `%10d`

Use tabs `\t` only

Use `align` function

It is automatic

Question 25

What does `input('Prompt', 's')` return if the user types `123`?

The string '123'

The number 123

A 1x3 double array

Error

Question 26

Which function allows you to display a warning message in orange text?

warning('Message')

error('Message')

disp('Message', 'orange')

alert('Message')

Question 27

How do you print a single quote `'` inside a `disp` string?

disp('It''s me')

disp('It's me')

disp("It's me")

Both A and C

Question 28

What does `mat2str` do?

Converts a matrix to a string representation that can be evaluated

Converts a matrix to a structure

Converts a .mat file to a string

Nothing

Question 29

If `x = [1, 2, 3]`, what does `fprintf('%d ', x)` output?

1 2 3

[1 2 3]

Error

Question 30

What is the purpose of the `error` function?

Displays a message in red and stops script execution

Displays a message and continues

Logs an error to a file

Checks for errors

Question 31

How do you read a single character from the keyboard without waiting for Enter?

k = getkey() (requires external tool) or pause (wait for key)

input('Prompt', 'char')

readchar()

Standard MATLAB requires Enter for `input`

Question 32

Which output function is best for creating tabular data in a text file?

fprintf

disp

save

textwrite

Question 33

What does `newline` return in modern MATLAB?

A character representing a new line

It prints a new line

It clears the line

Error

Question 34

How do you suppress the output of an assignment `x = 5`?

Add a semicolon: x = 5;

Use `silent(x = 5)`

Use `quiet` mode

You cannot

Question 35

What is the correct way to print 'Value is 10%'?

fprintf('Value is 10%%')

fprintf('Value is 10%')

disp('Value is 10%')

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Matlab Input & Output Quiz

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

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Question 19

Question 20

Question 21

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Question 26

Question 27

Question 28

Question 29

Question 30

Question 31

Question 32

Question 33

Question 34

Question 35

About This Input & Output Quiz

What You Will Practise

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Logical Indexing & Masking

Vectorization & Performance Optimization

Basic Math Operations

Creating and Using Vectors

Functions

Basic Plot Commands

Input & Output

Relational & Logical Operations

Arrays vs. Matrices