Why control flow directs program logic in MATLAB - Challenge Your Understanding

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this MATLAB code with if-else?

Consider this MATLAB code snippet. What will it print?

MATLAB

x = 5;
if x > 3
    disp('Greater than 3')
else
    disp('Less or equal to 3')
end

A Error: Missing end statement

B Less or equal to 3

C Greater than 3

D No output

💡 Hint

Check the condition x > 3 and what disp does.

The variable x is 5, which is greater than 3, so the if block runs and prints 'Greater than 3'.

❓ Predict Output

intermediate

What does this MATLAB for-loop print?

Look at this MATLAB code. What will it display?

MATLAB

for i = 1:3
    if mod(i,2) == 0
        disp('Even')
    else
        disp('Odd')
    end
end

A

Odd
Even
Odd

B

Even
Odd
Even

C Error: mod function not defined

D

Odd
Odd
Odd

💡 Hint

Remember mod(i,2) gives remainder when dividing by 2.

For i=1, remainder is 1 (odd), for i=2 remainder 0 (even), for i=3 remainder 1 (odd). So output is 'Odd', 'Even', 'Odd'.

❓ Predict Output

advanced

What is the output of this nested if-elseif-else in MATLAB?

Analyze this MATLAB code and select the output it produces.

MATLAB

score = 75;
if score >= 90
    disp('Grade A')
elseif score >= 80
    disp('Grade B')
elseif score >= 70
    disp('Grade C')
else
    disp('Grade F')
end

A Grade C

B Grade B

C Grade A

D Grade F

💡 Hint

Check which condition matches the value 75 first.

75 is not >= 90 or 80 but is >= 70, so 'Grade C' is printed.

❓ Predict Output

advanced

What error does this MATLAB code produce?

What error will this MATLAB code cause when run?

MATLAB

x = 10;
if x > 5
    disp('Big')
else
    disp('Small')

A No error, prints 'Big'

B Syntax error: Missing 'end' for if statement

C Runtime error: Undefined variable 'end'

D Syntax error: Unexpected else

💡 Hint

Check if all control blocks are properly closed.

The if statement is missing the end keyword, causing a syntax error.

🧠 Conceptual

expert

How does control flow direct program logic in MATLAB?

Which statement best explains why control flow is essential in MATLAB programming?

A Control flow automatically optimizes the program speed without programmer input.

B Control flow is only used to display output and has no effect on program logic.

C Control flow replaces the need for variables and functions in MATLAB.

D Control flow allows the program to make decisions and repeat actions, directing the order of execution.

💡 Hint

Think about how programs decide what to do next.

Control flow structures like if-else and loops let the program choose paths and repeat tasks, guiding the logic step-by-step.