FREE MATLAB Logical Operations & Flow Control Questions and Answers

Question 1

Which of the following logical operators performs an element-wise logical AND operation on two arrays in MATLAB?

Accepted Answer

`&`

Answer

`&&`

Answer

`and`

Answer

`*`

Question 2

You have a variable `x = 5`. Which of the following `if-elseif-else` constructs will correctly display 'x is positive and even'?

Accepted Answer

```matlab
if x > 0
    if mod(x, 2) == 0
        disp('x is positive and even');
    else
        disp('x is positive but odd');
    end
else
    disp('x is not positive');
end
```

Answer

```matlab
if x > 0 && mod(x, 2) == 0
    disp('x is positive and even');
elseif x > 0
    disp('x is positive but odd');
else
    disp('x is not positive');
end
```

Answer

```matlab
if x > 0 || mod(x, 2) == 0
    disp('x is positive and even');
elseif x > 0
    disp('x is positive but odd');
else
    disp('x is not positive');
end
```

Answer

```matlab
if x > 0 && mod(x, 2) == 0
    disp('x is positive and even');
end
if x > 0
    disp('x is positive but odd');
else
    disp('x is not positive');
end
```

Question 3

Consider the following MATLAB code snippet:
```matlab
a = [true false true];
b = [false true true];
c = ~a | b;
```
What will be the value of `c`?

Accepted Answer

`[true true true]`

Answer

`[false true false]`

Answer

`[false false true]`

Answer

`[true false false]`

Question 4

Which of the following MATLAB control flow statements allows for iterating through a sequence of values, such as elements in an array or numbers in a range?

Accepted Answer

`for`

Answer

`if`

Answer

`while`

Answer

`switch`

Question 5

A script needs to continuously read a sensor value and perform an action until the sensor value exceeds a certain threshold. Which control flow statement is most appropriate for this scenario?

Accepted Answer

`while` loop

Answer

`for` loop

Answer

`if-else` statement

Answer

`switch` statement

Question 6

You have a variable `day = 'Wednesday'`. Which `switch` statement correctly executes a block of code for 'Wednesday'?

Accepted Answer

```matlab
switch day
    case {'Monday', 'Tuesday'}
        disp('Early week');
    case 'Wednesday'
        disp('Mid-week');
    otherwise
        disp('Other day');
end
```

Answer

```matlab
switch day
    case 'Monday'
        disp('Start of week');
    case 'Wednesday'
        disp('Mid-week');
    otherwise
        disp('Other day');
end
```

Answer

```matlab
switch day == 'Wednesday'
    case true
        disp('Mid-week');
    otherwise
        disp('Other day');
end
```

Answer

```matlab
switch day
    case 'Wednesday'
        disp('Mid-week');
    case 'Monday'
        disp('Start of week');
    otherwise
        disp('Other day');
end
```