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You define pointer variables just as you define other variables, except that an asterisk appears in the definition when you define a pointer variable:
int i; /* Allocate space for an integer, i */ int *iptr; /* Allocate space for a pointer to an integer, iptr */
Thereafter, iptr, without an asterisk, identifies the location of an
address; *iptr, with an asterisk, identifies the location of the
integer identified by the address.