Quiz for for, while, do-while

Q1: Which loop is best suited when the number of iterations is known beforehand?

A. for loop B. while loop C. do-while loop D. switch statement

Q2: Which loop will always execute its body at least once?

A. for loop B. while loop C. do-while loop D. switch statement

Q3: What is the output of: int i=0; while(i<3){printf("%d",i); i++;}?

A. 012 B. 123 C. 0123 D. Error

Q4: Which loop is entry-controlled?

A. for loop B. while loop C. do-while loop D. Both A and B

Q5: What is wrong with: for(;;) { /* code */ }?

A. It will not compile B. It creates an infinite loop C. It runs only once D. Nothing wrong

Q6: Which loop is most suitable for reading input until EOF?

A. for loop B. while loop C. do-while loop D. if statement

Q7: How many times will do{ printf("Hi"); }while(0); print "Hi"?

A. 0 B. 1 C. Infinite D. Error

Q8: Which of the following is valid syntax for a for loop?

A. for(int i=0; i<5; i++) B. for i=0; i<5; i++ C. for(i=0; i<5) D. for(int i=0; i<5)

Q9: Which loop can be replaced by the other two without changing functionality?

A. for loop B. while loop C. do-while loop D. All of the above

Q10: What is the output of: for(int i=0;i<3;i++) printf("%d",i);?

A. 012 B. 123 C. 01 D. Error

Q11: Which loop is typically faster in execution?

A. for loop B. while loop C. do-while loop D. No significant difference

Q12: What does while(1) represent?

A. Condition always false B. Infinite loop C. Syntax error D. Executes once

Q13: Can we initialize multiple variables in a for loop?

A. Yes B. No C. Only integers D. Only floats

Q14: What is the default increment step in a for loop if not specified?

A. 1 B. 0 C. Depends on condition D. Compiler dependent

Q15: Which loop is better when body needs to run before checking condition?

A. for loop B. while loop C. do-while loop D. switch statement

Q16: Is it valid: while(x=5) { ... }?

A. Yes B. No C. Only with == D. Depends

Q17: What is the output of: int i=1; do{printf("%d",i);}while(i++<3);?

A. 1234 B. 123 C. 12 D. Error

Q18: What is a common use of an empty for loop?

A. Waiting/delay B. Error generation C. Skipping code D. Memory allocation

Q19: Which statement can be used to terminate a loop prematurely?

A. exit() B. stop C. break D. continue

Q20: Which statement skips the current iteration and continues with the next?

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