userforcount.cpp
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上传日期:2022-06-29
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书籍源码
开发平台:
Visual C++
- /*
- * 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
- */
- #include <iostream>
- int main()
- {
- std::cout << "Enter two numbers:" << std::endl;
- int v1, v2;
- std::cin >> v1 >> v2; // read input
- // use smaller number as lower bound for summation
- // and larger number as upper bound
- int lower, upper;
- if (v1 <= v2) {
- lower = v1;
- upper = v2;
- } else {
- lower = v2;
- upper = v1;
- }
- int sum = 0;
- // sum values from lower up to and including upper
- for (int val = lower; val <= upper; ++val)
- sum += val; // sum = sum + val
- std::cout << "Sum of " << lower
- << " to " << upper
- << " inclusive is "
- << sum << std::endl;
- return 0;
- }