java2009-ch04.rar_Java编程下载-pudn.com

<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/622b94a13d2fbb00076f16ac/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/622b94a13d2fbb00076f16ac/bg1.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _0"> </span>1</div><div class="t m0 x2 h4 y3 ff2 fs1 fc0 sc1 ls0 ws0">第四章</div><div class="t m0 x3 h4 y4 ff2 fs1 fc1 sc2 ls0 ws0">第四章</div><div class="t m0 x4 h4 y5 ff2 fs1 fc0 sc1 ls0 ws0">運算子、運算式與敘述</div><div class="t m0 x5 h4 y6 ff2 fs1 fc1 sc2 ls0 ws0">運算子、運算式與敘述 </div><div class="t m0 x6 h5 y7 ff2 fs2 fc0 sc0 ls0 ws0"> <span class="_ _1"> </span>認識運算式與<span class="_ _2"></span>運算子</div><div class="t m0 x7 h5 y8 ff2 fs2 fc0 sc0 ls0 ws0"> <span class="_ _1"> </span>學習各種常用<span class="_ _2"></span>的運算子</div><div class="t m0 x7 h5 y9 ff2 fs2 fc0 sc0 ls0 ws0"> <span class="_ _1"> </span>認識運算子的<span class="_ _2"></span>優先順序</div><div class="t m0 x8 h6 ya ff2 fs2 fc0 sc0 ls0 ws0">學習如何進行<span class="_ _2"></span>運算式之資料型態<span class="_ _2"></span>的轉換<span class="fs3"> </span></div></div></div><div class="pi" data-data='{"ctm":[1.333333,0.000000,0.000000,1.333333,0.000000,0.000000]}'></div></div> </body> </html>

<div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/622b94a13d2fbb00076f16ac/bg2.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _0"> </span>2</div><div class="t m0 x9 h7 yb ff2 fs4 fc1 sc2 ls0 ws0">認識運算式</div><div class="t m0 x9 h8 yc ff3 fs5 fc1 sc0 ls0 ws0"></div><div class="t m0 xa h9 yd ff2 fs6 fc0 sc0 ls0 ws0">運算式由<span class="fc2">運算元</span>（<span class="_ _3"> </span><span class="ff1">operand<span class="_ _3"> </span></span>）與<span class="fc2">運算子</span>（<span class="_ _3"> </span><span class="ff1">operator<span class="_ _3"> </span></span>）組成 </div><div class="t m0 x9 h8 ye ff3 fs5 fc1 sc0 ls0 ws0"></div><div class="t m0 xa h9 yf ff2 fs6 fc2 sc0 ls0 ws0">運算元<span class="fc0">可以是變數或是常數</span></div><div class="t m0 x9 h8 y10 ff3 fs5 fc1 sc0 ls0 ws0"></div><div class="t m0 xa h9 y11 ff2 fs6 fc2 sc0 ls0 ws0">運算子<span class="fc0">就是數學上的運算符號</span></div><div class="t m0 xa ha y12 ff3 fs7 fc3 sc0 ls0 ws0"></div><div class="t m0 xb hb y13 ff2 fs8 fc0 sc0 ls0 ws0">如「<span class="_ _4"> </span><span class="ff1">+<span class="_ _4"> </span></span>」、「<span class="_ _4"> </span><span class="ff1">-<span class="_ _4"> </span></span>」、「<span class="_ _4"> </span><span class="ff1">*<span class="_"> </span></span>」、<span class="_ _2"></span>「<span class="_ _4"> </span><span class="ff1">/<span class="_"> </span></span>」<span class="_ _2"></span>等 </div><div class="t m0 xc hc y14 ff1 fs9 fc4 sc0 ls0 ws0">4.1 </div><div class="t m0 xc hc y15 ff1 fs9 fc5 sc0 ls0 ws0">4.1 </div><div class="t m0 xd hd y14 ff2 fs9 fc4 sc0 ls0 ws0">運算式與運算子</div><div class="t m0 xd hd y15 ff2 fs9 fc5 sc0 ls0 ws0">運算式與運算子</div><div class="t m0 xe he y16 ff2 fsa fc0 sc0 ls0 ws0">典型的運算式</div></div></div><div class="pi" data-data='{"ctm":[1.333333,0.000000,0.000000,1.333333,0.000000,0.000000]}'></div></div>

<div id="pf3" class="pf w0 h0" data-page-no="3"><div class="pc pc3 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/622b94a13d2fbb00076f16ac/bg3.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _0"> </span>3</div><div class="t m0 x9 h7 yb ff2 fs4 fc1 sc2 ls0 ws0">設定運算子<span class="_ _5"> </span><span class="ff4 sc0">(1/2)</span></div><div class="t m0 x9 hf y17 ff3 fsb fc1 sc0 ls0 ws0"></div><div class="t m0 xf h10 y18 ff2 fsc fc0 sc0 ls0 ws0">等號（<span class="_ _6"> </span><span class="ff1">=<span class="_"> </span></span>）並不是「等於」，而是「設定」</div><div class="t m0 xc hc y14 ff1 fs9 fc4 sc0 ls0 ws0">4.1 </div><div class="t m0 xc hc y15 ff1 fs9 fc5 sc0 ls0 ws0">4.1 </div><div class="t m0 xd hd y14 ff2 fs9 fc4 sc0 ls0 ws0">運算式與運算子</div><div class="t m0 xd hd y15 ff2 fs9 fc5 sc0 ls0 ws0">運算式與運算子</div><div class="t m0 x9 hf y19 ff3 fsb fc1 sc0 ls0 ws0"></div><div class="t m0 xf h10 y1a ff2 fsc fc0 sc0 ls0 ws0">為各種不同資料型態的<span class="_ _7"></span>變數設值，可使用<span class="_ _7"></span><span class="fc2">設定<span class="_ _7"></span>運算子</span> </div><div class="t m0 x10 hd y1b ff2 fs9 fc0 sc0 ls0 ws0">將整數<span class="_ _8"> </span><span class="ff1">18<span class="_"> </span></span>設定給變數<span class="_ _8"> </span><span class="ff1">age</span></div><div class="t m0 x11 h11 y1c ff5 fsd fc0 sc0 ls0 ws0">age=age+1</div><div class="t m0 x12 hd y1d ff2 fs9 fc0 sc0 ls0 ws0">變數<span class="_ _8"> </span><span class="ff1">age+1<span class="_"> </span></span>之後的值再設定給<span class="_ _8"> </span><span class="ff1">age<span class="_"> </span></span>存放</div><div class="t m0 x13 h11 y1e ff5 fsd fc0 sc0 ls0 ws0">sum=num1+num2</div><div class="t m0 x14 hd y1f ff2 fs9 fc0 sc0 ls0 ws0">等號的右邊也可以是個運算式</div></div></div><div class="pi" data-data='{"ctm":[1.333333,0.000000,0.000000,1.333333,0.000000,0.000000]}'></div></div>

<div id="pf4" class="pf w0 h0" data-page-no="4"><div class="pc pc4 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/622b94a13d2fbb00076f16ac/bg4.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _0"> </span>4</div><div class="t m0 x9 h7 yb ff2 fs4 fc1 sc2 ls0 ws0">設定運算子 <span class="_ _5"> </span><span class="ff4 sc0">(2/2)</span></div><div class="t m0 x9 hf y20 ff3 fsb fc1 sc0 ls0 ws0"></div><div class="t m0 xf h10 y21 ff2 fsc fc0 sc0 ls0 ws0">下面的範例示範了設定<span class="_ _7"></span>運算子的使用： </div><div class="t m0 xc hc y14 ff1 fs9 fc4 sc0 ls0 ws0">4.1 </div><div class="t m0 xc hc y15 ff1 fs9 fc5 sc0 ls0 ws0">4.1 </div><div class="t m0 xd hd y14 ff2 fs9 fc4 sc0 ls0 ws0">運算式與運算子</div><div class="t m0 xd hd y15 ff2 fs9 fc5 sc0 ls0 ws0">運算式與運算子</div></div></div><div class="pi" data-data='{"ctm":[1.333333,0.000000,0.000000,1.333333,0.000000,0.000000]}'></div></div>

<div id="pf5" class="pf w0 h0" data-page-no="5"><div class="pc pc5 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/622b94a13d2fbb00076f16ac/bg5.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _0"> </span>5</div><div class="t m0 x9 h7 yb ff2 fs4 fc1 sc2 ls0 ws0">一元運算子 <span class="_ _5"> </span><span class="ff4 sc0">(1/2)</span> </div><div class="t m0 x9 h12 y22 ff3 fse fc1 sc0 ls0 ws0"></div><div class="t m0 xa h13 y23 ff2 fsf fc0 sc0 ls0 ws0">下面的敘述是由一元運算子與單一個運算<span class="_ _7"></span>元組成</div><div class="t m0 xa h14 y24 ff6 fse fc0 sc0 ls0 ws0">+6;<span class="_ _9"> </span>// <span class="_ _a"> </span><span class="ff2">表示正<span class="_ _a"> </span></span>6</div><div class="t m0 xa h14 y25 ff6 fse fc0 sc0 ls0 ws0">~a; <span class="_ _b"> </span>// <span class="_ _a"> </span><span class="ff2">表示取<span class="_ _a"> </span></span>a<span class="_ _a"> </span><span class="ff2">的<span class="_ _a"> </span></span>1<span class="_ _a"> </span><span class="ff2">補數</span></div><div class="t m0 xa h14 y26 ff6 fse fc0 sc0 ls0 ws0">x=-y<span class="_ _2"></span>;<span class="_ _c"> </span>// <span class="_ _a"> </span><span class="ff2">表示負<span class="_ _a"> </span></span>y<span class="_ _a"> </span><span class="ff2">的值設定給<span class="_ _2"></span>變數<span class="_ _a"> </span><span class="ff6">x<span class="_ _a"> </span></span>存放</span></div><div class="t m0 xa h14 y27 ff6 fse fc0 sc0 ls0 ws0">!a; <span class="_ _b"> </span>// a<span class="_ _a"> </span><span class="ff2">的<span class="_ _a"> </span></span>NOT<span class="_ _a"> </span><span class="ff2">運算，<span class="_ _2"></span>若<span class="_ _a"> </span><span class="ff6">a<span class="_ _d"> </span></span>為<span class="_ _a"> </span><span class="ff6">0<span class="_ _a"> </span></span>，則<span class="_ _a"> </span><span class="ff6">!a<span class="_ _a"> </span></span>為<span class="_ _a"> </span><span class="ff6">1<span class="_ _d"> </span></span>，若<span class="_ _a"> </span><span class="ff6">a<span class="_ _a"> </span></span>不為<span class="_ _a"> </span><span class="ff6">0<span class="_ _d"> </span></span>，則<span class="_ _a"> </span><span class="ff6">!a<span class="_ _a"> </span></span>為<span class="_ _a"> </span><span class="ff6">0 </span></span></div><div class="t m0 xc hc y14 ff1 fs9 fc4 sc0 ls0 ws0">4.1 </div><div class="t m0 xc hc y15 ff1 fs9 fc5 sc0 ls0 ws0">4.1 </div><div class="t m0 xd hd y14 ff2 fs9 fc4 sc0 ls0 ws0">運算式與運算子</div><div class="t m0 xd hd y15 ff2 fs9 fc5 sc0 ls0 ws0">運算式與運算子</div><div class="t m0 x15 hf y28 ff3 fsb fc1 sc0 ls0 ws0"></div><div class="t m0 x16 h10 y29 ff2 fsc fc0 sc0 ls0 ws0">一元運算子的成員</div></div></div><div class="pi" data-data='{"ctm":[1.333333,0.000000,0.000000,1.333333,0.000000,0.000000]}'></div></div>