Programming and Graphics

5.1 Pointers to scalars and characters 129

or

double *pname

Similar declarations are made for other types.

Once declared, a pointer can be evaluated using thereference operator,
(&). For example, ifpnameis a pointer to an integer andais an integer, we
may evaluate:

pname = &a;

Declaration and initialization can be combined into one statement:

int * pname = &a;

The following code contained in the filepointer2.ccevaluates four variables and
extracts their memory addresses through pointers:

#include <iostream>

#include <iomanip>

using namespace std;

int main()

{

int a=4;

float b=1.2;

double c=3.45;

char d=99;

int * memada;

float * memadb;

double * memadc;

char * memadd;

memada = &a;

memadb = &b;

memadc = &c;

memadd = &c;

cout << setw(5) << a <<""<<(unsigned int) memada << endl;

cout << setw(5) << b <<""<<(unsigned int) memadb << endl;

cout << setw(5) << c <<""<<(unsigned int) memadc << endl;

cout << setw(5) << d <<""<<(unsigned int) memadd << endl;

return 0;

}