C Programming - Pointers

The definition:

int *countPtr, count;

specifies that countPtr and count are of type int* —each is a pointer to an integer.

• True

• False

Answer explanation

Actually, count is an int, not a pointer to an int. The * applies only to countPtr and does not distribute to the other variable(s) in the definition.

A pointer may be initialized to NULL, 0 or an address.

• True

• False

Initializing a pointer to 0 is equivalent to initializing a pointer to NULL, but 0 is preferred.

• True

• False

Answer explanation

Actually, NULL is preferred because it highlights the fact that the variable is of a pointer type.

The only integer that can be assigned directly to a pointer variable is 0.

• True

• False

Initialize pointers to prevent unexpected results.

• True

• False

Assuming the definitions

double d = 98.6;

double *dPtr;

the following statement assigns variable d’s address to the pointer variable dPtr:

dPtr = &d;

Variable dPtr is then said to “point to” d.

• True

• False

The unary indirection operator (*) returns the value of the object to which its pointer operand points. Using * in this manner is called ______________ a pointer.

By default, arguments (other than arrays) are passed by value. Arrays are passed by reference.

• True

• False

Functions often require the capability to modify variables in the caller or receive a pointer to a large data object to avoid copying the object

• True

• False

Answer explanation

"return" can return one or more values from a called function to a caller.

• True

• False

Answer explanation

"return" may be used to return at most one value from a called function to a caller