In C, using a variable in an expression can result in a value or an address:

Some legal assembly language variables can conflict with C operators, such as dot (.) and question mark (?). These characters are replaced with an underscore (_).

Table 1.12 shows examples of variable references that are supported, including an indication of what type of reference is being made.

int A;

A = 5;

long temp;

temp = 9;

int arr[10], *LABEL;

LABEL = arr;

arr[3] = 8;

int AB[10][10], *LABX;

LABX = AB[5];

LABX = LABEL;

char *p,c;

p = &c;

c = *LABEL;

When you refer to a variable in a C/C++ expression that is not fully referenced, you are referring to the address of that variable, not the value. For this reason, the variable is considered unreferenced. The normal C operators are implemented to modify references. Table 1.13 shows the C operators.

These operators let you reference, or get the value of, and dereference, or get the address of, variables. The concept of referenced and dereferenced variables also applies to breakpoints. For example:

BREAKACCESS arrayname

This command sets an access breakpoint at the start address of the array arrayname because arrayname is not fully referenced.

The following form of the command sets a breakpoint at the value stored in arrayname[3] and not the address of arrayname[3], because it is fully referenced:

BREAKACCESS arrayname[3]

By including the special operator &, the following command enables you to set a breakpoint at the address of the array element arrayname[3]:

BREAKACCESS &arrayname[3]