scores.cpp

C++Primer 第四版 包括windows 平台下各章的例子程序

/*
 * 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: [phone]
*/ 

#include "algs_preamble.h"
#include <ctime>

int main() {
    vector<int> scores;

    // populate with random values
    for (vector<int>::size_type i =  0; i != 10; ++i)
	    scores.push_back(rand());
    // print what we got
    for (vector<int>::size_type i =  0; i != 10; ++i)
	    cout << scores[i] << " ";
    cout << endl;

    // put top 3 scorse at the front of the vector
    partial_sort(scores.begin(), 
                 scores.begin() + 3, scores.end());

    // use nth_element to find the median score
    nth_element(scores.begin(), 
            scores.begin() + scores.size()/2, scores.end());

    cout << "median value " << *(scores.begin() + scores.size()/2) << endl;
    for (vector<int>::size_type i =  0; i != 10; ++i)
	    cout << scores[i] << " ";
    cout << endl;
}