Pointers Interview Questions

    Question 1: Pointer Basics

    What does a pointer variable store in C?

    Question 2: Declaring a Pointer

    Which of the following correctly declares a pointer to an integer?

    Question 3: Pointer Dereferencing

    What will be the output of this program?

    #include <stdio.h>

int main() {
    int x = 10;
    int *p = &x;
    printf("%d", *p);
    return 0;
}

    Question 4: Pointer Assignment

    What will be printed?

    #include <stdio.h>

int main() {
    int a = 5, b = 20;
    int *p = &a;
    p = &b;
    printf("%d", *p);
    return 0;
}

    Question 5: NULL Pointer

    What does a NULL pointer represent in C?

    Question 6: Pointer and Array

    What will be the output?

    #include <stdio.h>

int main() {
    int arr[] = {10, 20, 30};
    int *p = arr;
    printf("%d", *(p+1));
    return 0;
}

    Question 7: Pointer Arithmetic

    If p is an integer pointer pointing to address 1000, what will p+1 point to (assuming 4-byte int)?

    Question 8: Double Pointer

    What will be the output?

    #include <stdio.h>

int main() {
    int x = 42;
    int *p = &x;
    int **q = &p;
    printf("%d", **q);
    return 0;
}

    Question 9: Dangling Pointer

    When does a dangling pointer occur in C?

    Question 10: Function Pointers

    Which is the correct syntax to declare a pointer to a function that takes int as argument and returns int?