Week 3 - Memory Basics, Pointers & Arrays

Question 1

What is the output of the following program?

#include 
int main(){
  int a [10];
  for (int i = 0; i < 10; i++){
    a[i] = i;
  }
  int *pa = &a[3];
  printf("%ld\n", a[2] * (pa - a));
}

Answer 1

6

Question 2

How do you declare an array of 10 pointers to char?

Answer 2

char *p[10]

Question 3

What is a pointer?

Answer 3

a variable that contains the address of another variable

Question 4

what is &?

Answer 4

address operator - gives the address of an object

Question 5

what is *?

Answer 5

dereferencing operator - gives the value stored at an address