C Pointer

When we declare a variable, its type tells the compiler how much storage to set for it. Storage for the variable is allocated automatically.

• Never assume a pointer has a specific size.
• Space is allocated only for the pointer itself, not for the referece data.

Storage for the data is allocated in two ways:

• declaring a variable
• by allocating stroage dynamically at runtime (using malloc, realloc)

Array Reference:

int f() {
  int a[10], *iptr;
  iptr = a;
  iptr[0] = 5;

  return 0;
}

Pointer Reference:

int f(){
  int a[10], *iptr;
  iptr = a;
  *iptr = 5;

  return 0;
}