第9周项目求1000以内所有偶数和

</pre><ol><li class="alt"><span class="comment">/* </span> </li><li><span class="comment"> * Copyright (c) 2014, 烟台大学计算机学院 </span> </li><li class="alt"><span class="comment"> * All rights reserved. </span> </li><li><span class="comment"> * 文件名称：test.cpp </span> </li><li class="alt"><span class="comment"> * 作    者：范星月 </span> </li><li><span class="comment"> * 完成日期：2014年 10 月 22 日 </span> </li><li class="alt"><span class="comment"> * 版 本 号：v1.0 </span> </li><li><span class="comment"> * </span> </li><li class="alt"><span class="comment"> * 问题描述：利用三种循环求1000以内所以偶数的和；</span></li><li class="alt"><span class="comment"></span><span class="comment">* 输入描述：</span> 一个变量n；</li><li class="alt"><span class="comment"> * 程序输出：输出一个变量sum</span></li><li class="alt"><span class="comment">*/</span></li></ol><p> </p><p> </p><pre class="cpp" name="code">

#include <iostream>

using namespace std;

int main()
{
    int i,s;

    for  (i=0,s=0; i<=1000; s=s+i,i+=2);
    cout << "s" <<s<< endl;
    return 0;
}

</pre></div><p class="alt"></p><div class="alt"><pre class="html" name="code">#include <iostream>

using namespace std;

int main()
{
    int i,s;

    for  (i=0,s=0; i<=1000; s=s+i,i+=2);
    cout << "s" <<s<< endl;
    return 0;
}

#include <iostream>

using namespace std;

int main()
{
    int i,s;

    for  (i=0,s=0; i<=1000; s=s+i,i+=2);
    cout << "s" <<s<< endl;
    return 0;
}