MCQs on Control Statements | C Programming

Chapter 4: Control Statements.

---

Conditional Statements (if, if-else, nested if-else)

1. Which statement is used to test a condition in C?

• a) for
• b) while
• c) if
• d) switch

1. What is the syntax of an if statement in C?

• a) if (condition) { statements; }
• b) if condition (statements;)
• c) if condition { statements; }
• d) if (condition) statements;

1. What is the output of the following code?

   int x = 5;
   if (x < 10)
       printf("Hello");
   else
       printf("World");

• a) Hello
• b) World
• c) HelloWorld
• d) No output

1. In a nested if statement, which else is executed if multiple if statements exist?

• a) The first else
• b) The last else
• c) The nearest if without an else
• d) None of the above

1. What will be the output of the following code?

   int x = 5, y = 8;
   if (x < 10)
       if (y > 10)
           printf("A");
       else
           printf("B");

• a) A
• b) B
• c) No output
• d) Error

Switch Case Statements

6. Which keyword is used to end a switch statement in C?

• a) break
• b) end
• c) exit
• d) return

6. What will happen if the break statement is omitted in a switch case?

• a) Only that case executes
• b) Compiler error
• c) All subsequent cases execute
• d) The switch ends

6. Which of the following types cannot be used in a switch expression?

• a) int
• b) char
• c) float
• d) enum

6. What is the purpose of the default case in a switch statement?

• a) To handle all cases
• b) To execute if no other case matches
• c) To end the switch
• d) Optional for all switches

6. What is the output of the following code?c int x = 2; switch (x) { case 1: printf("One"); case 2: printf("Two"); case 3: printf("Three"); default: printf("Default"); }
   • a) Two
   • b) TwoThreeDefault
   • c) Three
   • d) Default

Loops (for, while, do-while)

11. Which loop executes at least once, regardless of the condition?
    • a) for
    • b) while
    • c) do-while
    • d) if
12. What is the output of the following code?int i = 0; while (i < 3) { printf("%d", i); i++; }
    • a) 012
    • b) 123
    • c) 0123
    • d) Error
13. Which keyword is used to skip an iteration in a loop?
    • a) skip
    • b) continue
    • c) break
    • d) return
14. How many times will the following code print “Hello”?for (int i = 0; i < 3; i++) { printf("Hello"); }
    • a) 1
    • b) 2
    • c) 3
    • d) Infinite
15. Which loop is most suitable if the number of iterations is known?
    • a) while
    • b) for
    • c) do-while
    • d) if

Break and Continue

16. What does the break statement do?
    • a) Stops the loop immediately
    • b) Skips to the next iteration
    • c) Ends the program
    • d) Nothing
17. What is the output of the following code?for (int i = 0; i < 5; i++) { if (i == 2) break; printf("%d", i); }
    • a) 01234
    • b) 01
    • c) 012
    • d) Error
18. What does the continue statement do?
    • a) Ends the loop
    • b) Skips the current iteration and continues with the next one
    • c) Exits the program
    • d) None of the above
19. What is the output of the following code?for (int i = 0; i < 3; i++) { if (i == 1) continue; printf("%d", i); }
    • a) 01
    • b) 02
    • c) 012
    • d) 1
20. Which statement cannot be used outside loops?
    • a) break
    • b) continue
    • c) return
    • d) printf

Goto and Labels

21. Which statement allows jumping to a label in C?
    • a) goto
    • b) jump
    • c) continue
    • d) exit
22. What is a major drawback of using goto statements?
    • a) Code readability decreases
    • b) Execution speed decreases
    • c) Increases complexity
    • d) Both a and c
23. What is the output of the following code?int x = 0; label: printf("%d", x); x++; if (x < 3) goto label;
    • a) 012
    • b) 123
    • c) 01
    • d) 0
24. Which keyword is used to mark a label?
    • a) :
    • b) ;
    • c) ->
    • d) .
25. When should goto be used in C programming?
    • a) To improve efficiency
    • b) To avoid deep nesting of code
    • c) To jump to another function
    • d) None of the above

---

26. Which statement correctly represents the syntax of an if-else block?
    • a) if (condition) { statement1; } else { statement2; }
    • b) if (condition) statement1; else statement2;
    • c) if condition statement1; else statement2;
    • d) if (condition) statement1; else { statement2; }
27. What is the primary purpose of the if statement in C?
    • a) To perform repetitive tasks
    • b) To check a condition and execute a block of code if it’s true
    • c) To allow multiple conditions
    • d) To end the program
28. In C, what will the else if ladder help achieve?
    • a) Test multiple conditions in sequence
    • b) Create a loop
    • c) Ignore conditional statements
    • d) Execute code only once
29. What is printed by the following code?int x = 10; if (x == 10) printf("A"); else if (x > 5) printf("B"); else printf("C");
    • a) A
    • b) B
    • c) C
    • d) No output
30. What will happen if there is no else statement in an if-else construct?
    • a) Code will not compile
    • b) The else statement is optional
    • c) Syntax error
    • d) Compiler warning

Switch Case Statements (continued)

31. What will be the output of the following code?int x = 3; switch (x) { case 1: printf("One"); break; case 2: printf("Two"); break; case 3: printf("Three"); break; default: printf("Default"); }
    • a) Default
    • b) One
    • c) Three
    • d) Error
32. Which case in the switch statement will execute if no match is found?
    • a) The first case
    • b) None
    • c) The last case
    • d) The default case
33. What will be the output of the following code if x = 4?switch (x) { case 3: printf("Three"); break; case 4: printf("Four"); break; default: printf("Default"); }
    • a) Four
    • b) Default
    • c) Three
    • d) Error
34. Can float be used as an expression in switch statement?
    • a) Yes
    • b) No
    • c) Only with default
    • d) None of the above
35. In a switch case, which statement is required to prevent fall-through behavior?
    • a) continue
    • b) break
    • c) exit
    • d) None

Loops (continued)

36. Which loop is known as the entry-controlled loop?
    • a) for
    • b) while
    • c) do-while
    • d) goto
37. What is the output of the following code?int i = 1; do { printf("%d", i); i++; } while(i < 4);
    • a) 1
    • b) 12
    • c) 123
    • d) Error
38. Which loop is known as an exit-controlled loop?
    • a) for
    • b) while
    • c) do-while
    • d) None of the above
39. Which loop is best for situations when the condition must be checked before entering the loop?
    • a) for
    • b) while
    • c) do-while
    • d) goto
40. How many times will the following code print “Hi”?
    c for (int i = 0; i < 2; i++) { for (int j = 0; j < 2; j++) { printf("Hi"); } }
    • a) 2
    • b) 4
    • c) 6
    • d) 8

Break and Continue (continued)

41. What is the output of the following code?int i = 0; while (i < 5) { i++; if (i == 3) continue; printf("%d", i); }
    • a) 12345
    • b) 1245
    • c) 12
    • d) Error
42. In which scenarios is the break statement commonly used?
    • a) Loops
    • b) switch statements
    • c) if statements
    • d) Both a and b
43. Which keyword forces the loop to terminate the current iteration and continue with the next one?
    • a) break
    • b) continue
    • c) exit
    • d) jump
44. Which will execute only once for each pass of the loop?
    • a) break
    • b) continue
    • c) default
    • d) None
45. Which loop structure will repeat until i becomes 5?
    c int i = 0; while (i < 5) { i++; }
    • a) for loop
    • b) while loop
    • c) do-while loop
    • d) None

Goto and Labels (continued)

46. Which statement is a direct jump to another point in the code?
    • a) break
    • b) continue
    • c) goto
    • d) exit
47. What is printed by the following code?int x = 0; label1: printf("%d", x); x++; if (x < 3) goto label1;
    • a) 123
    • b) 012
    • c) 01
    • d) 0
48. How does the use of goto generally affect program readability?
    • a) Improves readability
    • b) Makes the program complex and hard to read
    • c) Makes debugging easier
    • d) None of the above
49. When can goto be useful?
    • a) In structured programming
    • b) To avoid deeply nested conditions
    • c) In modern coding practices
    • d) Both a and c
50. What is the recommended approach to using goto?
    • a) Use it frequently for efficiency
    • b) Avoid it whenever possible
    • c) Use only for specific situations
    • d) Never use it

---

Answer Key Table for Chapter 4: Control Statements

Q	Answer	Q	Answer	Q	Answer	Q	Answer	Q	Answer
1	c	11	c	21	a	31	c	41	b
2	a	12	a	22	d	32	d	42	d
3	a	13	b	23	a	33	a	43	b
4	c	14	c	24	a	34	b	44	a
5	b	15	b	25	b	35	b	45	b
6	a	16	a	26	a	36	b	46	c
7	c	17	b	27	b	37	c	47	b
8	c	18	b	28	a	38	c	48	b
9	b	19	b	29	a	39	b	49	b
10	b	20	b	30	b	40	b	50	c

---