Arduino Quiz Questions and Answers

1. To subtract 1 from a variable counter, you can use the following statement(s) (check all that apply)

Counter - 1;

Counter--;

--counter;

Counter -= 1;

Decrement(counter);

Counter = counter - 1;

The correct answer options for subtracting 1 from a variable counter are counter--, --counter, counter -= 1, and counter = counter - 1. These options all perform the same operation of subtracting 1 from the value of the counter variable. The decrement(counter) option is not a valid syntax for subtracting 1 from a variable in most programming languages.

Explanation

The correct answer options for subtracting 1 from a variable counter are counter--, --counter, counter -= 1, and counter = counter - 1. These options all perform the same operation of subtracting 1 from the value of the counter variable. The decrement(counter) option is not a valid syntax for subtracting 1 from a variable in most programming languages.

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2. The "Arduino Language" is best described as?

A subset of standard C++

Similar to Java

A special-purpose language designed for beginning programmers.

A subset of C#

C with additional library functions

The "Arduino Language" is best described as a subset of standard C++. Arduino uses a simplified version of C++ to make it easier for beginners to program microcontrollers. While it shares similarities with C++, it has its own set of libraries and functions specifically designed for working with Arduino boards.

Explanation

The "Arduino Language" is best described as a subset of standard C++. Arduino uses a simplified version of C++ to make it easier for beginners to program microcontrollers. While it shares similarities with C++, it has its own set of libraries and functions specifically designed for working with Arduino boards.

3. Is there anything wrong with this line of code, if yes, what?

if(myVar = true) Serial.println("The light is ON");

The = should be ==

The line has invalid syntax, and will produce a compiler error.

There needs to be a space after the if keyword.

There is nothing wrong.

An if statement must use braces.

The line of code is assigning the value of true to the variable myVar instead of checking if myVar is equal to true. To compare the value, the equality operator == should be used instead of the assignment operator =.

Explanation

The line of code is assigning the value of true to the variable myVar instead of checking if myVar is equal to true. To compare the value, the equality operator == should be used instead of the assignment operator =.

4. What is the value of foo when these lines of code are executed?

foo = 12;
foo = foo % 10;

1

2

1.2

None of the above

% is the "modulus" or "remainder" operator. the value of a%b is the remainder when a is divided by b.

Explanation

% is the "modulus" or "remainder" operator. the value of a%b is the remainder when a is divided by b.

5. What is the index of the letter F in this array?

char textMessage[] = "Have Fun with Arduino";

5

6

4

'F'

&textMessage+5

The index of the letter F in the array "Have Fun with Arduino" is 5. This means that the letter F is the 6th character in the array, counting from 0.

Explanation

The index of the letter F in the array "Have Fun with Arduino" is 5. This means that the letter F is the 6th character in the array, counting from 0.

6. What does this line of code do?

temp = !temp;

Sets the variable temp to its logical compliment.

Converts the variable temp to a boolean value.

The line is not a legal Arduino statement.

None of the above

Performs a factorial calculation.

The "!" operator performs a logical (boolean) complement, true becomes false, HIGH becomes LOW (0 becomes 1, any non-zero value becomes 0.)

Explanation

The "!" operator performs a logical (boolean) complement, true becomes false, HIGH becomes LOW (0 becomes 1, any non-zero value becomes 0.)

7. How many elements are in the array?

char textMessage[] = "Have Fun with Arduino";

20

21

22

The statement is not a legal Arduino program statement.

None of the above

The array "textMessage" contains 21 elements. In C and C++ programming languages, when a string is enclosed in double quotation marks (" "), each character of the string plus a null terminator ('\0') is automatically included in the array. Therefore, the string "Have Fun with Arduino" consists of 20 characters plus a null terminator, making a total of 21 elements in the array.

Explanation

The array "textMessage" contains 21 elements. In C and C++ programming languages, when a string is enclosed in double quotation marks (" "), each character of the string plus a null terminator ('\0') is automatically included in the array. Therefore, the string "Have Fun with Arduino" consists of 20 characters plus a null terminator, making a total of 21 elements in the array.

8. What does the word static do in this line of code?

static int temperature = 0;

The variable's value is retained the next time it is accessed.

The value of temperature will not be allowed to change.

The variable will be reset to 0 each time loop() runs.

The variable will have a greater range than a normal int

The line is not a legal Arduino program statement.

None of the above

"static", when applied to a local variable within a function, causes the variable to become "permanent", with it's value retained until the next time it is accessed from within that function (even if the function returns and is invoked again.)

Explanation

"static", when applied to a local variable within a function, causes the variable to become "permanent", with it's value retained until the next time it is accessed from within that function (even if the function returns and is invoked again.)

9. What does this line of code do? counter++;

Increment counter by an amount that depends on its definition.

This is not a legal statement in the Arduino language.

Adds 1 to the variable counter

Returns true if the variable counter has a positive value.

None of the above

The line of code "counter++;" adds 1 to the variable counter. It is a shorthand way of incrementing the value of the counter by 1.

Explanation

The line of code "counter++;" adds 1 to the variable counter. It is a shorthand way of incrementing the value of the counter by 1.

10. What is the range of numbers you can store in a variable of type byte?

0 to 255

-128 to 127

0 to 9

0 to 65535

0 to 4294967295

In most programming languages, a variable of type byte can store integer values in the range of -128 to 127. This range represents 256 different possible values, covering both positive and negative numbers.

Explanation

In most programming languages, a variable of type byte can store integer values in the range of -128 to 127. This range represents 256 different possible values, covering both positive and negative numbers.

11. Which language features are NOT present in the normal Arduino environment? (Check all that apply)

Inheritance

Standard Template Library

Exceptions

Operator overloading

Floating Point math operations

Object Oriented Programming

Pointers

Files

The normal Arduino environment does not include the Standard Template Library (STL), Exceptions, and the ability to work with Files. The STL is a library that provides a collection of generic algorithms and data structures, which are not available in the Arduino environment. Exceptions are a mechanism for handling errors and abnormal conditions, but Arduino does not support them. Similarly, Arduino does not have built-in support for working with files, such as reading from or writing to external storage devices.

Explanation

The normal Arduino environment does not include the Standard Template Library (STL), Exceptions, and the ability to work with Files. The STL is a library that provides a collection of generic algorithms and data structures, which are not available in the Arduino environment. Exceptions are a mechanism for handling errors and abnormal conditions, but Arduino does not support them. Similarly, Arduino does not have built-in support for working with files, such as reading from or writing to external storage devices.

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Arduino Quiz Questions And Answers