The only operations that can be carried out on pointers in C are summarized below:

1. A pointer variable in C can be assigned the address of an ordinary variable (e.g., pv = &v)
2. A pointer variable can be assigned the value of another pointer variable (e.g., pv = px) provided both the pointers point to objects of the same data type
3. A pointer variable in C can be assigned a null (zero) value (e.g., pv = NULL, where NULL is a symbolic constant that represents the value 0)
4. An integer quantity can be added to or subtracted from a pointer variable (e.g., pv = 3, ++pv, etc)
5. One pointer variable can be subtracted from another provided both pointers point to elements of the same array
6. Two pointer variables in C can be compared provided both pointers point to objects of the same data type

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