Quiz for Loops for, while, do-while

Q1: Which loop will always execute at least once?

A. for loop B. while loop C. do-while loop D. none of these

Q2: What is the correct syntax for a for loop?

A. for(initialization; condition; increment) {} B. for(condition; initialization; increment) {} C. for(increment; condition; initialization) {} D. for(increment; initialization; condition) {}

Q3: Which loop checks the condition before executing the loop body?

A. do-while B. for C. while D. both for and while

Q4: What will be output of this code? int i=0; while(i<3) { cout << i; i++; }

A. 012 B. 123 C. 321 D. No output

Q5: What keyword exits a loop immediately?

A. break B. continue C. exit D. return

Q6: What does the continue statement do in loops?

A. Exits the loop B. Skips current iteration C. Pauses the loop D. Restarts the program

Q7: Which loop is best when number of iterations is known?

A. while B. do-while C. for D. none

Q8: Can a for loop be used without all three expressions (init, condition, increment)?

A. Yes B. No C. Only if condition is missing D. Only if increment is missing

Q9: What happens if the condition in a while loop is false initially?

A. Loop executes once B. Loop never executes C. Error D. Loop executes twice

Q10: Which loop structure is guaranteed to execute at least once?

A. while B. for C. do-while D. none

Q11: How can infinite loops be created?

A. Condition always true B. No increment C. break statement missing D. All of the above

Q12: Which keyword can be used to skip the current iteration?

A. break B. continue C. exit D. restart

Q13: Is it possible to nest loops in C++?

A. Yes B. No C. Only for loops D. Only while loops

Q14: What is the output of: for(int i=0; i<3; i++) cout << i;

A. 012 B. 123 C. 321 D. No output

Q15: Which loop is used when condition must be checked after executing the loop body?

A. while B. for C. do-while D. none

Q16: Can you omit the increment expression in a for loop?

A. Yes, if increment inside loop B. No C. Only in while loop D. Only in do-while

Q17: What is the result of: int i=0; do { cout << i; } while(i>0);

A. 0 B. No output C. Infinite loop D. Error

Q18: Which of the following can be used to create an infinite loop?

A. for(;;) B. while(true) C. do {} while(true) D. All of the above

Q19: Which loop control can skip execution of loop body for some iterations?

A. break B. continue C. return D. exit

Q20: What is the purpose of a loop?

A. Repeat code multiple times B. Make decisions C. Handle errors D. Declare variables