已知y=2*x^2 - 3*x^4 + 6*x^5 - 4*x + 50,求x=0 到 x=代码,C代码库,德仔网

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【C】已知y=2*x^2 - 3*x^4 + 6*x^5 - 4*x + 50,求x=0 到 x=
作者:Dezai.CN / 发布于2011/7/8/ 818
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<span style="color: #0000ff"><strong>程序1：已知y=2*x^2 - 3*x^4 + 6*x^5 - 4*x + 50,求x=0 到 x=2 以步长为0.2递增时y的最小值和最大值。</strong></span>
<strong>知识点：</strong>
pow（计算次方值） 
相关函数 exp，log，log10 
表头文件 #include<math.h> 
定义函数 double pow(double x,double y); 
函数说明 pow()用来计算以x为底的y次方值，即xy值，然后将结果返回。 
返回值 返回x的y次方计算结果。 
错误代码 EDOM 参数x为负数且参数y不是整数。 
<strong>附加说明 使用GCC编译时请加入-lm。</strong> 
代码：
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<pre><div><span style="color: #008000">//</span><span style="color: #008000">程序1；</span><span style="color: #008000"></span><span style="color: #000000">#include </span><span style="color: #000000"><</span><span style="color: #000000">stdio.h</span><span style="color: #000000">></span><span style="color: #000000">#include </span><span style="color: #000000"><</span><span style="color: #000000">stdlib.h</span><span style="color: #000000">></span><span style="color: #000000">#include </span><span style="color: #000000"><</span><span style="color: #000000">math.h</span><span style="color: #000000">></span><span style="color: #000000"></span><span style="color: #0000ff">float</span><span style="color: #000000"> y(</span><span style="color: #0000ff">float</span><span style="color: #000000"> x);</span><span style="color: #0000ff">float</span><span style="color: #000000"> y(</span><span style="color: #0000ff">float</span><span style="color: #000000"> x){  </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #800080">2</span><span style="color: #000000">*</span><span style="color: #000000">x</span><span style="color: #000000">*</span><span style="color: #000000">x </span><span style="color: #000000">-</span><span style="color: #000000"> </span><span style="color: #800080">3</span><span style="color: #000000">*</span><span style="color: #000000">pow(x,</span><span style="color: #800080">4</span><span style="color: #000000">.) </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #800080">6</span><span style="color: #000000">*</span><span style="color: #000000">pow(x,</span><span style="color: #800080">5</span><span style="color: #000000">.) </span><span style="color: #000000">-</span><span style="color: #000000"> </span><span style="color: #800080">4</span><span style="color: #000000">*</span><span style="color: #000000">x </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #800080">50</span><span style="color: #000000">;}</span><span style="color: #0000ff">int</span><span style="color: #000000"> main(){  </span><span style="color: #0000ff">float</span><span style="color: #000000"> x;  </span><span style="color: #0000ff">float</span><span style="color: #000000"> miny;  </span><span style="color: #0000ff">float</span><span style="color: #000000"> maxy;  x</span><span style="color: #000000">=</span><span style="color: #800080">0</span><span style="color: #000000">;  miny </span><span style="color: #000000">=</span><span style="color: #000000"> y(x);  maxy </span><span style="color: #000000">=</span><span style="color: #000000"> y(x);  </span><span style="color: #0000ff">while</span><span style="color: #000000"> (x</span><span style="color: #000000"><=</span><span style="color: #800080">2</span><span style="color: #000000">)  {    x </span><span style="color: #000000">+=</span><span style="color: #000000"> </span><span style="color: #800080">0.2</span><span style="color: #000000">;    </span><span style="color: #0000ff">if</span><span style="color: #000000"> (miny </span><span style="color: #000000">></span><span style="color: #000000"> y(x))    {      miny </span><span style="color: #000000">=</span><span style="color: #000000"> y(x);    }    </span><span style="color: #0000ff">if</span><span style="color: #000000"> (maxy </span><span style="color: #000000"><</span><span style="color: #000000"> y(x))    {      maxy </span><span style="color: #000000">=</span><span style="color: #000000"> y(x);    }  }  printf(</span><span style="color: #800000">"</span><span style="color: #800000">y的最小值为：%f\ny的最大值为：%f\n</span><span style="color: #800000">"</span><span style="color: #000000">, miny, maxy);  return 1;</span></div><div><span style="color: #000000">}</span></div><div></div><div></div><div></div></pre>
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运行结果：
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<pre><div><span style="color: #000000">[hanxi@hanxi</span><span style="color: #000000">-</span><span style="color: #000000">workstation Documents]$ gcc </span><span style="color: #000000">-</span><span style="color: #000000">lm code1.c[hanxi@hanxi</span><span style="color: #000000">-</span><span style="color: #000000">workstation Documents]$ .</span><span style="color: #000000">/</span><span style="color: #000000">a.</span><span style="color: #0000ff">out</span><span style="color: #000000">y的最小值为：</span><span style="color: #800080">48.397758</span><span style="color: #000000">y的最大值为：</span><span style="color: #800080">194.000092</span></div></pre>
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