C Programming Multiple Choice Questions (MCQs) and Answers

Q61 What will be the output of the following C code?
int main() {
int num = 10;
increment(num);
printf("%d", num);
return 0;
} void increment(int n) {
n++;
}

Q62 What is the output of this recursive function call?
int main() {
printf("%d ", factorial(5));
return 0;
}
int factorial(int n) {
if (n==0)
return 1;
else
return n * factorial(n - 1);
}

Q63 Pseudocode:

FUNCTION Add(a, b) RETURN a PLUS b END FUNCTION CALL Add(5, 10)

Q64 Pseudocode:

FUNCTION CheckEven(number) IF number MOD 2 EQUALS 0 THEN RETURN True ELSE RETURN False END FUNCTION CALL CheckEven(4)

Q65 Pseudocode:

FUNCTION Fibonacci(n) IF n LESS THAN OR EQUAL TO 1 THEN RETURN n ELSE RETURN Fibonacci(n-1) PLUS Fibonacci(n-2) END FUNCTION CALL Fibonacci(5)

Q66 Identify the error in this C code:
int main() {
printHello();
return 0;
}
void printHello() {
printf("Hello");
}

Q67 Spot the mistake:
int main() {
int result = sum(5, 10);
printf("%d", result);
return 0;
}
int sum(int a, int b) {
return;
}

Q68 Find the error:

int main() {
int x = 5;
increment(&x);
printf("%d", x);
return 0;
}
void increment(int* n) {
*n++;
}

Q69 How do you declare an array of integers in C?

Q70 Which index is used to access the first element of an array in C?

Q71 What happens when you try to access an array element outside its bounds in C?

Q72 How do you initialize an array in C?

Q73 Which of the following is a correct way to pass an array to a function in C?

Q74 What is the size of a 2-dimensional array int arr[3][4]; in C?

Q75 How can you access the third element in the second row of a 2D array int arr[3][4]; in C?

Q76 What is the default value of an uninitialized array in C?

Q77 How does C handle array index out of bounds errors during runtime?

Q78 In C, can an array be resized after its declaration?

Q79 What will be the output of the following C code?
int main() {
int arr[] = {1, 2, 3, 4, 5};
printf("%d", arr[3]);
return 0;
}

Q80 What is the output of this C code?
int main() {
int arr[5] = {1, 2, 3};
printf("%d", arr[4]);
return 0;
}

Q81 What does the following C code do?
int main() {
int arr[3][4] = {{1, 2}, {3, 4}};
printf("%d", arr[1][1]);
return 0;
}

Q82 Complete the C code:
int main() {
int arr[5];
for(int i = 0; i < 5; i++) { ___ }
printf("%d", arr[2]);
return 0;
}

Q83 Pseudocode:

ARRAY numbers[5] SET numbers[0] TO 1 PRINT numbers[0]

Q84 Pseudocode:

ARRAY arr[10] FOR i FROM 0 TO 9 SET arr[i] TO i TIMES 2 END FOR PRINT arr[6]

Q85 Pseudocode:

FUNCTION SumArray(ARRAY arr, SIZE) SET sum TO 0 FOR i FROM 0 TO SIZE-1 INCREMENT sum BY arr[i] RETURN sum

Q86 Pseudocode:

ARRAY matrix[2][3] SET matrix[0][0] TO 1, matrix[0][1] TO 2, matrix[0][2] TO 3, matrix[1][0] TO 4, matrix[1][1] TO 5, matrix[1][2] TO 6 PRINT matrix[1][2]

Q87 Identify the error in this C code:
int main() {
int arr[3];
arr[3] = 10;
printf("%d", arr[3]);
return 0;
}

Q88 Find the mistake:
int main() {
int arr[5] = {1, 2, 3, 4, 5};
for(int i = 0; i <= 5; i++) {
printf("%d ", arr[i]);
}
return 0;
}

Q89 What is a pointer in C?

Q90 What is the output of sizeof(pointer) where pointer is an integer pointer in C?