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

  1. int *ptr;

  2. int ptr;

  3. int &ptr;

  4. pointer int ptr;

[ Option A ]

int *ptr; declares a pointer to an integer.
char *ptr; declares a pointer to a character.
float *ptr; declare a pointer to a float.
int **ptr; declares pointer to a int * and so on.

What is the size of a pointer on a 64-bit system?

  1. 2 Bytes

  2. 8 Bytes

  3. 4 Bytes

  4. Depends on data type it points to

[ Option B ]

On a 64-bit system, pointers are typically 8 bytes, regardless of the data type they point to.