Control Structures – C Programming MCQ Questions and Answers

Latest C Programming - Control Structures MCQ quiz section | Questions and answer with Solution | Jobvision.in

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1 What is the output of given program if user enter value 99?

A) Enter a number:99

B) Enter a number:99 Number is divisible by 5

C) complier error

D) Run time error

Answer & Solution

Answer: Option A
Solution: since this program isn't having any syntax error so program is executed. It is clearly seen that 99 is not divisible by 5. So if statement will not execute and program will terminate.

2 What is the output of given program if user enter xyz ?

A) Enter your age: xyz You have lived for 0 seconds

B) Enter your age: xyz You have lived for 0.00000 seconds

C) Enter your age: xyz after that program will stop

D) Run time error

Answer & Solution

Answer: Option B
Solution: When we give scanf() a %f format string, that means We want you to try and get us a floating point number. When we provide input like 'xyz', it's not going to match anything, because 'xyz' is not a valid floating-point number.

3 What is the output of given program if user enter xyz ?

A) Enter your age : xyz Your age is not valid

B) Enter your age: xyz You have lived for 0 seconds

C) Enter your age: xyz Your age is not valid

D) Complier error

Answer & Solution

Answer: Option C
Solution: When we give scanf() a %f format string, that means We want you to try and get us a floating point number. When we provide input like 'xyz', it's not going to match anything, because 'xyz' is not a valid floating-point number.

4 What will be the output of the given program?

A) 10 10 11 11

B) 10 20 21 21

C) 10 20 21 10

D) 10 20 21 20

Answer & Solution

Answer: Option C
Solution: The scope of second declaration of i is limited to the block in which it is defined. Outside of the block variable is not recognized.

5 What will be the value of i and j after execution of following program?

A) 10 10

B) 10 20

C) 20 20

D) Run time error

Answer & Solution

Answer: Option C
Solution:

6 What will be the output given program?

A) -10 to -1

B) -10 to infinite

C) -10 to 0

D) Complier error

Answer & Solution

Answer: Option A
Solution: for loop can be initialized outside of the loop. Since until -1 value of i remain a non-zero value and hence the condition is true up to -1. But when i is further increases its value becomes 0 and condition becomes false and loop stops there. Note:In C any non-zero value(positive or negative) evaluates to true and only zero value is evaluates to false.

7 What will be the output of the given program?

A) 12 7

B) 5 6

C) 6 6

D) 6 7

Answer & Solution

Answer: Option C
Solution: Here if condition evaluates to true as a non-zero value i.e 5 is assigned to a. So the value of a = 5 and after increment value of b = 6. In printf statement due to pre-increment of a value of a printed will be 6 and due to post-increment of b value of b printed will be 6 and not 7.

8 What will be the output of the given program?

A) well done jobvision

B) jobvision

C) complier error

D) None of these

Answer & Solution

Answer: Option B
Solution: As the value of variable value is zero so, it evaluates to false in the if condition.

9 What will be the output of the given program?

A) 100 100 100

B) 5 0 20

C) 5 0 100

D) 100 0 100

Answer & Solution

Answer: Option D
Solution: Expression value2%5 is equal to 0 and this value assigned to value1. Therefore if condition reduces to if(0) so it fails. Therefore body of if will not be executed i.e num = 5 will not be assigned. So at printf num = 100 , value1 = 0 and value2 = 100.

10 What will be the output of the given program?

A) 5 5.600000

B) 6 5.600000

C) 0 5.600000

D) Complier error

Answer & Solution

Answer: Option D
Solution: compiler error switch expression is not integral. switch statement cannot work on float value.

16 Which command is used to skip the rest of a loop and carry on from the top of the loop again?

A) break

B) resume

C) continue

D) None of these

Answer & Solution

Answer: Option C
Solution: Syntax: continue ;

Causes control to pass to the end of the innermost enclosing while, do, or for statement, at that point the loop continuation condition is re-evaluated. Example:

17 What is the output of the following program?

A) 20

B) 24

C) 25

D) None of these

Answer & Solution

Answer: Option C
Solution:

18 What is the output of the following statements?

A) 10 11 12 13 14

B) 10 11 12 13 14 15

C) 9 10 11 12 13

D) Infinite loop

Answer & Solution

Answer: Option D
Solution: Since the condition is always true it will go to infinite loop.

19 The type of the controlling expression of a switch statement cannot be of the type ........

A) int

B) char

C) short

D) float

Answer & Solution

Answer: Option D
Solution: No explanation is given for this question Let's Discuss on Board

20

A) The increment should always be ++k .

B) The variable must always be the letter i when using a for loop.

C) There should be a semicolon at the end of the statement.

D) The commas should be semicolons.

Answer & Solution

Answer: Option D
Solution: In for loop the three statements parts are separated by two semicolons which are missing here.

21 Find the output of the following program

A) 11

B) 12

C) 13

D) 14

Answer & Solution

Answer: Option C
Solution:

22 What will be the value of sum after the following program is executed?

A) 1

B) 2

C) 9

D) 0.5

Answer & Solution

Answer: Option B
Solution: No explanation is given for this question

23 What is the right choice, if the following loop is implemented?

A) A run time error will be generated.

B) The program will not enter into the loop.

C) There will be a compilation error reported.

D) The loop will run infinitely many times.

Answer & Solution

Answer: Option D
Solution: As the value of num is decremented(--num) and again incremented(++num) and hence no change in num and it remains 0 only causing infinite loop.

24 What will be the final value of the digit?

A) -1

B) 17

C) 19

D) 16

Answer & Solution

Answer: Option C
Solution:

25 What will be the following code's output if choice = 'R'?

A) RED

B) RED WHITE BLUE ERROR

C) RED ERROR

D) RED WHITE BLUE

Answer & Solution

Answer: Option B
Solution: As the first option is matching, the cases are evaluated till the break statement is encountered or end of switch statement is encountered.

26 Consider the following program fragment

What would be the value of sum for the input 1, -1, 2, -2, 3, -3, 4, -4, 5, -5

A) -5

B) 30

C) 10

D) 15

Answer & Solution

Answer: Option d
Solution: It is summation of 1+2+3+4+5 as continue statement is going to be executed for every input of -1, -2, -3, -4, -5.

27 What will be printed if the following code is executed?

A) x=0

B) x=5

C) x=4

D) x=1

Answer & Solution

Answer: Option B
Solution: No explanation is given for this question

28 Consider the following code

What is the output of the above program?

A) 6

B) 8

C) Runtime error

D) Syntax error

Answer & Solution

Answer: Option D
Solution: break can't be used with selection control structures, but can used with repetitive(for, while), or select control structure(switch).

29 What will be the value of i and j after execution of following program?

A) 10 10

B) 10 20

C) 20 20

D) Run time error

Answer & Solution

Answer: Option C
Solution:

30 What will be the output given program?

A) -10 to -1

B) -10 to infinite

C) -10 to 0

D) Complier error

Answer & Solution

Answer: Option A
Solution:

for loop can be initialized outside of the loop. Since until -1 value of i remain a non-zero value and hence the condition is true up to -1. But when i is further increases its value becomes 0 and condition becomes false and loop stops there.

Note:In C any non-zero value(positive or negative) evaluates to true and only zero value is evaluates to false.