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Quiz: C Pointers

5 questionsNo time limitPass: 60%+10 XP on first pass

The topic every C learner fears, made simple with pictures. Addresses, & and *, pointers and arrays, pointer arithmetic, NULL, pointer to pointer and const pointers.

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  1. Question 1

    What does this print?

    #include <stdio.h>
int main(void) {
    int x = 5;
    int *p = &x;
    *p = *p + 10;
    printf("%d", x);
    return 0;
}
  2. Question 2

    For int a[] = {2, 4, 6, 8};, what is *(a + 3)?

  3. Question 3

    If p is an int pointer holding address 1000 (int = 4 bytes), what address is p + 2?

  4. Question 4

    What does this print?

    #include <stdio.h>
int main(void) {
    int a[] = {1, 2, 3};
    int *p = a;
    p++;
    printf("%d", *p * 10);
    return 0;
}
  5. Question 5

    What happens when you dereference a NULL pointer?