求a*x^2+b*x+c=0的根代码,C代码库,德仔网

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【C】求a*x^2+b*x+c=0的根
作者:Dezai.CN / 发布于2011/7/8/ 830
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<div><span style="color: #008000">//</span><span style="color: #008000">求a*x^2+b*x+c=0的根</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">math.h</span><span style="color: #000000">></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"> a,b,c;
 </span><span style="color: #0000ff">float</span><span style="color: #000000"> tmp;
 
 printf(</span><span style="color: #800000">"</span><span style="color: #800000">输入数据\na=</span><span style="color: #800000">"</span><span style="color: #000000">);
 scanf(</span><span style="color: #800000">"</span><span style="color: #800000">%f</span><span style="color: #800000">"</span><span style="color: #000000">,</span><span style="color: #000000">&</span><span style="color: #000000">a);
 printf(</span><span style="color: #800000">"</span><span style="color: #800000">b=</span><span style="color: #800000">"</span><span style="color: #000000">);
 scanf(</span><span style="color: #800000">"</span><span style="color: #800000">%f</span><span style="color: #800000">"</span><span style="color: #000000">, </span><span style="color: #000000">&</span><span style="color: #000000">b);
 printf(</span><span style="color: #800000">"</span><span style="color: #800000">c=</span><span style="color: #800000">"</span><span style="color: #000000">);
 scanf(</span><span style="color: #800000">"</span><span style="color: #800000">%f</span><span style="color: #800000">"</span><span style="color: #000000">, </span><span style="color: #000000">&</span><span style="color: #000000">c);
 
 tmp</span><span style="color: #000000">=</span><span style="color: #000000">b</span><span style="color: #000000">*</span><span style="color: #000000">b</span><span style="color: #000000">-</span><span style="color: #800080">4</span><span style="color: #000000">*</span><span style="color: #000000">a</span><span style="color: #000000">*</span><span style="color: #000000">c;
 
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (tmp</span><span style="color: #000000">></span><span style="color: #800080">0</span><span style="color: #000000">)
 {
 printf(</span><span style="color: #800000">"</span><span style="color: #800000">方程的根为：%f和%f\n</span><span style="color: #800000">"</span><span style="color: #000000">, (</span><span style="color: #000000">-</span><span style="color: #000000">b</span><span style="color: #000000">+</span><span style="color: #000000">sqrt(tmp))</span><span style="color: #000000">/</span><span style="color: #800080">2</span><span style="color: #000000">,(</span><span style="color: #000000">-</span><span style="color: #000000">b</span><span style="color: #000000">-</span><span style="color: #000000">sqrt(tmp))</span><span style="color: #000000">/</span><span style="color: #800080">2</span><span style="color: #000000">);
 }
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (tmp</span><span style="color: #000000">==</span><span style="color: #800080">0</span><span style="color: #000000">)
 {
 printf(</span><span style="color: #800000">"</span><span style="color: #800000">方程的根为：%f\n</span><span style="color: #800000">"</span><span style="color: #000000">, </span><span style="color: #000000">-</span><span style="color: #000000">b</span><span style="color: #000000">/</span><span style="color: #800080">2</span><span style="color: #000000">);
 }
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (tmp</span><span style="color: #000000"><</span><span style="color: #800080">0</span><span style="color: #000000">)
 {
 printf(</span><span style="color: #800000">"</span><span style="color: #800000">方程无解\n</span><span style="color: #800000">"</span><span style="color: #000000">);
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #800080">1</span><span style="color: #000000">;
}</span></div>
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