do-while vs do loop Quiz

What is the main difference between a while loop and a do-while loop?

• A: A while loop checks the condition before executing the loop body, while a do-while loop checks the condition after executing the loop body.
• B: A while loop can iterate an infinite number of times, while a do-while loop cannot.
• C: A while loop is used for definite iteration, while a do-while loop is used for indefinite iteration.
• D: There is no difference between them.

How many times will the following loop execute? int x = 5; do { cout << x << endl; x--; } while (x > 0);

• A: 0 times
• B: 4 times
• C: 5 times
• D: Infinitely

What is the output of the following code? int num = 0; do { cout << num << " "; num += 2; } while (num < 5);

• A: 0 2 4
• B: 0 2 4 6
• C: 2 4
• D: 2 4 6

What is the output of the following code? int i = 0; while (i < 5) { cout << i << " "; i--; }

• A: 0 1 2 3 4
• B: 0 -1 -2 -3 -4 .......................never ends
• C: no output
• D: 4 3 2 1 0

Which of the following is a valid syntax for a do-while loop in C++?

• A: do { // code } while (condition);
• B: do while (condition) { // code }
• C: do { // code } while condition;
• D: do while (condition); { // code }