求出数列的前20项之和代码,Java代码库,德仔网

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【Java】求出数列的前20项之和

作者:Dezai.CN / 发布于2011/3/25/ 605

题目：有一分数序列：2/1，3/2，5/3，8/5，13/8，21/13...求出这个数列的前20项之和。程序分析：请抓住分子与分母的变化规律。

<div><span style="color: #000000"></span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">class</span><span style="color: #000000"> test20 {
</span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> main(String[] args) {
</span><span style="color: #0000ff">float</span><span style="color: #000000"> fm </span><span style="color: #000000">=</span><span style="color: #000000"> 1f;
 </span><span style="color: #0000ff">float</span><span style="color: #000000"> fz </span><span style="color: #000000">=</span><span style="color: #000000"> 1f;
 </span><span style="color: #0000ff">float</span><span style="color: #000000"> temp;
 </span><span style="color: #0000ff">float</span><span style="color: #000000"> sum </span><span style="color: #000000">=</span><span style="color: #000000"> 0f;
 </span><span style="color: #0000ff">for</span><span style="color: #000000"> (</span><span style="color: #0000ff">int</span><span style="color: #000000"> i</span><span style="color: #000000">=</span><span style="color: #000000">0</span><span style="color: #000000">;i</span><span style="color: #000000"><</span><span style="color: #000000">20</span><span style="color: #000000">;i</span><span style="color: #000000">++</span><span style="color: #000000">){
 temp </span><span style="color: #000000">=</span><span style="color: #000000"> fm;
 fm </span><span style="color: #000000">=</span><span style="color: #000000"> fz;
 fz </span><span style="color: #000000">=</span><span style="color: #000000"> fz </span><span style="color: #000000">+</span><span style="color: #000000"> temp;
 sum </span><span style="color: #000000">+=</span><span style="color: #000000"> fz</span><span style="color: #000000">/</span><span style="color: #000000">fm;
 </span><span style="color: #008000">//</span><span style="color: #008000">System.out.println(sum);</span><span style="color: #008000">
</span><span style="color: #000000"> }
 System.out.println(sum);
}
}
</span></div>

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