Array and Pointer Quiz

You are writing a program to store some scores in an array. You want to print the third score stored. int arr[] = {1, 2, 3, 4}; printf("%d", arr[2]); What is the output?

• 1

• 2

• 3

• 4

You have two arrays representing sensor readings. You want to calculate the sum of the first and last values in one of these arrays. int arr[] = {5, 6, 7}; printf("%d", arr[0] + arr[2]); What is the output?

• 5

• 6

• 7

• 12

You partially initialize an array and want to print the first and last elements of it. int arr[4] = {1}; printf("%d %d", arr[0], arr[3]); What is the output?

• 1 1

• 1 0

• 0 1

• 0 0

In a loop, you print all elements of an integer array initialized with three values. int arr[3] = {10, 20, 30}; for(int i = 0; i < 3; i++) printf("%d ", arr[i]); What does this print?

• 10 20 30

• 20 30 10

• 30 20 10

• 10 30 20

You store characters in a char array intending it to be a string and then print it. char arr[] = {'a', 'b', 'c', '\0'}; printf("%s", arr); What does this output?

• abc

• a

• ab

• Error

You use pointer arithmetic to access the second element of an integer array. int arr[3] = {1, 2, 3}; printf("%d", *(arr + 1)); What is the output?

• 1

• 2

• 3

• Garbage value

You are confused about pointer dereferencing and arithmetic. You print *arr + 1 on an integer array. int arr[3] = {1, 2, 3}; printf("%d", *arr + 1); What is the output?

• 0

• 1

• 2

• 3

You use a 2D integer array and want to print the value at the first column of the second row. int arr[2][2] = {{1, 2}, {3, 4}}; printf("%d", arr[1][0]); What will be printed?

• 1

• 2

• 3

• 4

When printing elements of an integer array, you decide to print only at every alternate index starting from zero. int arr[5] = {1, 2, 3, 4, 5}; for(int i = 0; i < 5; i += 2) printf("%d ", arr[i]); What is the output?

• 1 2 3 4 5

• 1 3 5

• 1 3

• 1 3 5

You want to find the number of elements in an integer array by dividing the total size of the array by the size of one element. int arr[] = {2, 4, 6, 8}; printf("%d", sizeof(arr)/sizeof(arr[0])); What does this print?

• 2

• 4

• 8

• Depends on compiler