72ae61a6a1e875846f330ddbba0fbf42.zip
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72ae61a6a1e875846f330ddbba0fbf42.zip <link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/css/base.min.css" rel="stylesheet"/><link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/css/fancy.min.css" rel="stylesheet"/><link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/89547424/raw.css" rel="stylesheet"/><div id="sidebar" style="display: none"><div id="outline"></div></div><div class="pf w0 h0" data-page-no="1" id="pf1"><div class="pc pc1 w0 h0"><img alt="" class="bi x0 y0 w1 h1" src="/image.php?url=https://csdnimg.cn/release/download_crawler_static/89547424/bg1.jpg"/><div class="c x1 y1 w2 h2"><div class="t m0 x2 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0">n</div></div><div class="t m1 x3 h4 y3 ff2 fs0 fc0 sc1 ls0 ws0">Class1<span class="_ _0"></span>7</div><div class="t m1 x4 h4 y4 ff3 fs0 fc0 sc1 ls0 ws0">课程标题：数<span class="_ _0"></span>字王国</div><div class="t m1 x4 h4 y5 ff3 fs0 fc0 sc1 ls0 ws0">课程内容：<span class="ff4 fs1 sc0">本<span class="_ _1"></span>课<span class="_ _1"></span>是<span class="_ _2"></span><span class="ff5"> <span class="_ _2"></span>for <span class="_ _0"></span><span class="ff4">循环和</span>if <span class="_ _1"></span><span class="ff4">条<span class="_ _2"></span>件<span class="_ _2"></span>判<span class="_ _2"></span>断<span class="_ _1"></span>语<span class="_ _2"></span>句<span class="_ _2"></span>综<span class="_ _1"></span>合<span class="_ _2"></span>使<span class="_ _2"></span>用<span class="_ _2"></span>的<span class="_ _1"></span>应<span class="_ _2"></span>用<span class="_ _2"></span>。<span class="_ _1"></span>主<span class="_ _2"></span>要<span class="_ _2"></span>通<span class="_ _2"></span>过<span class="_ _1"></span><span class="ff5"> <span class="_ _2"></span>for <span class="_ _1"></span><span class="ff4">循<span class="_ _1"></span>环<span class="_ _1"></span>和</span></span></span></span></span></div><div class="t m1 x4 h5 y6 ff5 fs1 fc0 sc0 ls0 ws0">i<span class="_ _1"></span>f<span class="_ _1"></span> <span class="_ _2"></span><span class="ff4">条<span class="_ _2"></span>件<span class="_ _2"></span>语<span class="_ _2"></span>句<span class="_ _2"></span>的<span class="_ _2"></span>嵌<span class="_ _2"></span>套<span class="_ _2"></span>找<span class="_ _1"></span>到<span class="_ _2"></span>任<span class="_ _2"></span>意<span class="_ _2"></span>两<span class="_ _2"></span>个<span class="_ _2"></span>数<span class="_ _2"></span>字<span class="_ _2"></span>之<span class="_ _2"></span>间<span class="_ _2"></span>的<span class="_ _2"></span>质<span class="_ _2"></span>数<span class="_ _2"></span>，<span class="_ _2"></span>以<span class="_ _1"></span>及<span class="_ _2"></span>如<span class="_ _2"></span>何<span class="_ _2"></span>修<span class="_ _2"></span>改<span class="_ _2"></span>参<span class="_ _2"></span>数<span class="_ _2"></span>能<span class="_ _2"></span>够<span class="_ _2"></span>使<span class="_ _2"></span>程<span class="_ _2"></span>序<span class="_ _2"></span>跑<span class="_ _1"></span>的<span class="_ _2"></span>更<span class="_ _2"></span>快<span class="_ _2"></span>。</span></div><div class="t m1 x4 h4 y7 ff3 fs0 fc0 sc1 ls0 ws0">难易度分析：</div><div class="t m1 x4 h4 y8 ff4 fs0 fc0 sc0 ls0 ws0">质数<span class="_ _3"> </span>易</div><div class="t m1 x4 h4 y9 ff4 fs0 fc0 sc0 ls0 ws0">质数的判断<span class="_ _4"> </span>中</div><div class="t m1 x4 h4 ya ff4 fs0 fc0 sc0 ls0 ws0">循环的嵌套应用<span class="_ _5"> </span>难</div><div class="t m1 x4 h4 yb ff4 fs0 fc0 sc0 ls0 ws0">循环优化<span class="_ _6"> </span>中</div><div class="t m1 x4 h4 yc ff3 fs0 fc0 sc1 ls0 ws0">知识点解析<span class="ff4 sc0">：</span></div><div class="t m1 x4 h4 yd ff4 fs0 fc0 sc0 ls0 ws0">本节课主要<span class="_ _1"></span>应用<span class="ff5"> for </span>循<span class="_ _1"></span>环找出指定<span class="_ _1"></span>范围内的所<span class="_ _1"></span>有质数，外<span class="_ _1"></span>层循环控制<span class="_ _1"></span>数字的变</div><div class="t m1 x4 h4 ye ff4 fs0 fc0 sc0 ls0 ws0">化<span class="_ _1"></span>，<span class="_ _1"></span><span class="ff5"> <span class="_ _2"></span><span class="ff4">内层<span class="_ _2"></span>循环<span class="_ _2"></span>判<span class="_ _1"></span>断<span class="_ _1"></span>当<span class="_ _1"></span>前<span class="_ _2"></span>数字<span class="_ _2"></span>是否<span class="_ _2"></span>为质<span class="_ _2"></span>数<span class="_ _1"></span>。<span class="_ _1"></span>主<span class="_ _1"></span>要<span class="_ _2"></span>用到<span class="_ _2"></span>的知<span class="_ _2"></span>识内<span class="_ _2"></span>容<span class="_ _1"></span>有<span class="_ _1"></span>：<span class="_ _1"></span>循<span class="_ _2"></span>环<span class="ff5"> <span class="_ _2"></span>for<span class="_ _0"></span><span class="ff4">、<span class="_ _1"></span>求</span></span></span></span></div><div class="t m1 x4 h4 yf ff4 fs0 fc0 sc0 ls0 ws0">余<span class="_ _1"></span><span class="ff5">%<span class="_ _1"></span><span class="ff4">、<span class="_ _2"></span>平方<span class="_ _2"></span>根工<span class="_ _2"></span>具<span class="ff5"> <span class="_ _2"></span>sqrt()</span></span></span></div><div class="t m1 x4 h4 y10 ff3 fs0 fc0 sc1 ls0 ws0">关键词<span class="ff4 sc0">：</span></div><div class="t m1 x4 h4 y11 ff5 fs0 fc0 sc0 ls0 ws0">1<span class="ff4">、</span>n <span class="_ _7"></span><span class="ff4">能被<span class="ff5"> <span class="_ _7"></span>i <span class="_ _7"></span><span class="ff4">整除的条件<span class="_ _8"> </span><span class="ff5">n%i==0</span></span></span></span></div><div class="t m1 x4 h4 y12 ff5 fs0 fc0 sc0 ls0 ws0">2<span class="ff4">、</span>n <span class="_ _7"></span><span class="ff4">是质数的条件<span class="ff5">(n>1)<span class="_ _9"> </span></span>除了<span class="ff5"> <span class="_ _7"></span>1 <span class="_ _7"></span><span class="ff4">和<span class="ff5"> <span class="_ _7"></span>n <span class="_ _7"></span><span class="ff4">以外，<span class="ff5">n <span class="_ _7"></span><span class="ff4">不能被其他数字整除</span></span></span></span></span></span></span></div><div class="t m1 x4 h4 y13 ff5 fs0 fc0 sc0 ls0 ws0">3<span class="ff4">、让程序执行的更快<span class="_ _a"> </span>只需要除以</span> <span class="_ _7"></span>2-<span class="_ _b"> </span><span class="ff4">之间的数</span></div></div><div class="pi" data-data='{"ctm":[1.611639,0.000000,0.000000,1.611639,0.000000,0.000000]}'></div></div>