If-elseif-else statements in MATLAB - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of nested if-elseif-else

What is the output of the following MATLAB code?

MATLAB

x = 5;
if x < 3
    disp('Less than 3')
elseif x < 7
    disp('Between 3 and 6')
else
    disp('7 or more')
end

A Between 3 and 6

B Less than 3

C 7 or more

D No output

💡 Hint

Check which condition matches the value of x first.

Since x = 5, the first condition (x < 3) is false, but the second (x < 7) is true, so it prints 'Between 3 and 6'.

❓ Predict Output

intermediate

Value of variable after if-elseif-else

What is the value of variable y after running this code?

MATLAB

a = 10;
if a > 15
    y = 1;
elseif a == 10
    y = 2;
else
    y = 3;
end

A 3

B 1

C 2

D Undefined

💡 Hint

Check which condition matches the value of a.

a equals 10, so the second condition (a == 10) is true, setting y to 2.

❓ Predict Output

advanced

Output with multiple elseif conditions

What will be displayed when this code runs?

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 F

B Grade B

C Grade A

D Grade C

💡 Hint

Check the conditions from top to bottom.

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

❓ Predict Output

advanced

Output with logical operators in conditions

What does this code display?

MATLAB

temp = 15;
if temp < 0
    disp('Freezing')
elseif temp >= 0 && temp <= 20
    disp('Cold')
else
    disp('Warm')
end

A Freezing

B Cold

C Warm

D No output

💡 Hint

Check the range that temp falls into.

15 is between 0 and 20 inclusive, so it prints 'Cold'.

❓ Predict Output

expert

Output of nested if-elseif-else with variable changes

What is the final value of z after this code runs?

MATLAB

x = 3;
y = 5;
if x > y
    z = x - y;
elseif x == y
    z = x + y;
else
    if y > 10
        z = y - x;
    else
        z = x + y;
    end
end

A 8

B 12

C 2

D Error

💡 Hint

Follow the logic step by step, including the nested if.

x (3) is not greater than y (5), and not equal, so else runs. Inside else, y (5) is not greater than 10, so z = x + y = 8.