Control Flow Statements in C++ MCQ question and answer with solution

1

What is the syntax for the 'if' statement in C++?

A) if (condition) then statement; B) if (condition) then { statement; } C) if { condition } then { statement; } D) if (condition) { statement; }

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Answer & Solution

Answer: Option D

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2

What is the purpose of the 'else' statement in C++?

A) Executes after the 'if' block B) Executes before the 'if' block C) Executes when the 'if' condition is false D) Executes regardless of the 'if' block

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Answer & Solution

Answer: Option C

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3

What is the correct syntax for the 'switch' statement in C++?

A) switch (expression) { case constant1: statement1; case constant2: statement2; } B) switch (expression) { case constant1: statement1; break; case constant2: statement2; break; default: defaultStatement; } C) switch (expression) { case constant1: statement1; default: defaultStatement; } D) None of the above

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Answer & Solution

Answer: Option B

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4

What will be the output of the following code: int x = 10; if (x > 5) cout << "Hello"; else cout << "Goodbye"; in C++?

A) Compilation error B) HelloGoodbye C) Hello D) Goodbye

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Answer & Solution

Answer: Option C

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5

What does the 'break' statement do in a loop in C++?

A) Skips the current iteration B) Skips the next iteration C) Starts the next iteration D) Terminates the loop

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Answer & Solution

Answer: Option D

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6

What is the correct syntax for the 'while' loop in C++?

A) while (condition) { statement; } B) while (condition) then { statement; } C) while { condition } { statement; } D) while { statement; } condition;

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Answer & Solution

Answer: Option A

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7

What will be the output of the following code: int i = 0; while (i < 5) { cout << i << " "; i++; } in C++?

A) Compilation error B) 1 2 3 4 C) 0 1 2 3 D) 0 1 2 3 4

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Answer & Solution

Answer: Option D

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8

What is the purpose of the 'default' case in a 'switch' statement in C++?

A) Executes before any other cases B) Executes after all other cases C) Executes when no case matches D) Executes instead of the 'case' cases

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Answer & Solution

Answer: Option C

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9

What is the syntax for the 'do-while' loop in C++?

A) do { condition; } while (statement); B) do { statement; } while (condition); C) do (condition) { statement; } while; D) None of the above

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Answer & Solution

Answer: Option B

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10

What will be the output of the following code: for (int i = 5; i >= 0; --i) { cout << i << " "; if (i == 3) break; } in C++?

A) Compilation error B) 5 4 3 C) 5 4 3 2 1 0 D) 5 4 3 0 1

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Answer & Solution

Answer: Option B

Solution:

The given code is a for loop in C++:

for (int i = 5; i >= 0; --i) {
cout << i << " ";
if (i == 3) break;
}

This loop initializes i to 5 and decrements it in each iteration until i becomes less than 0.

On each iteration, it prints the current value of i followed by a space.

When i becomes 3, the if condition becomes true and the break statement terminates the loop.

Therefore, the values printed are: 5 4 3

No further values (like 2, 1, 0) are printed because the loop exits when i == 3.

Hence, the correct output is: 5 4 3

Control Flow Statements in C++ MCQ question and answer with solution | C++ Programimg MCQs