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//Download by http://www.NewXing.com /* * This file contains code from "C++ Primer, Fourth Edition", by Stanley B. * Lippman, Jose Lajoie, and Barbara E. Moo, and is covered under the * copyright and warranty notices given in that book: * * "Copyright (c) 2005 by Objectwrite, Inc., Jose Lajoie, and Barbara E. Moo." * * * "The authors and publisher have taken care in the preparation of this book, * but make no expressed or implied warranty of any kind and assume no * responsibility for errors or omissions. No liability is assumed for * incidental or consequential damages in connection with or arising out of the * use of the information or programs contained herein." * * Permission is granted for this code to be used for educational purposes in * association with the book, given proper citation if and when posted or * reproduced.Any commercial use of this code requires the explicit written * permission of the publisher, Addison-Wesley Professional, a division of * Pearson Education, Inc. Send your request for permission, stating clearly * what code you would like to use, and in what specific way, to the following * address: * * Pearson Education, Inc. * Rights and Contracts Department * 75 Arlington Street, Suite 300 * Boston, MA 02216 * Fax: (617) 848-7047 */ // swap values of two pointers to int void ptrswap(int *&v1, int *&v2) { int *tmp = v2; v2 = v1; v1 = tmp; } #include <iostream> using std::endl; using std::cout; void ptrswap(int *&v1, int *&v2); int main() { int i = 10; int j = 20; int *pi = &i; // pi points to i int *pj = &j; // pj points to j cout << "Before ptrswap():\t*pi: " << *pi << "\t*pj: " << *pj << endl; ptrswap(pi, pj); // now pi points to j; pj points to i cout << "After ptrswap():\t*pi: " << *pi << "\t*pj: " << *pj << endl; return 0; }