输入三条线段的长度，判定它能否组成一个三角形代码,C代码库,德仔网

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【C】输入三条线段的长度，判定它能否组成一个三角形
作者:Dezai.CN / 发布于2011/7/8/ 891
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<pre><div><span style="color: #008000">//</span><span style="color: #008000">程序11：输入三条线段的长度，判定它能否组成一个三角形。如果可以构成三角形，打印它所构成的三角形所构成的类型：等边/等腰/直角/任意三角形。</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"></span><span style="color: #0000ff">int</span><span style="color: #000000"> fun(</span><span style="color: #0000ff">float</span><span style="color: #000000"> a, </span><span style="color: #0000ff">float</span><span style="color: #000000"> b, </span><span style="color: #0000ff">float</span><span style="color: #000000"> c){  </span><span style="color: #0000ff">int</span><span style="color: #000000"> n</span><span style="color: #000000">=</span><span style="color: #800080">0</span><span style="color: #000000">;  </span><span style="color: #008000">//</span><span style="color: #008000">n=0代表任意三角形  </span><span style="color: #008000">//</span><span style="color: #008000">n=1代表等边三角形  </span><span style="color: #008000">//</span><span style="color: #008000">n=2代表等腰三角形  </span><span style="color: #008000">//</span><span style="color: #008000">n=3代表直角三角形  </span><span style="color: #008000">//</span><span style="color: #008000">n=4代表不能构成三角形  </span><span style="color: #008000">//</span><span style="color: #008000">n=5代表等要直角三角形</span><span style="color: #008000"></span><span style="color: #000000">    </span><span style="color: #0000ff">if</span><span style="color: #000000"> (a</span><span style="color: #000000">+</span><span style="color: #000000">b</span><span style="color: #000000">></span><span style="color: #000000">c </span><span style="color: #000000">&&</span><span style="color: #000000"> abs(a</span><span style="color: #000000">-</span><span style="color: #000000">b)</span><span style="color: #000000"><</span><span style="color: #000000">c)  {    </span><span style="color: #0000ff">if</span><span style="color: #000000"> (a</span><span style="color: #000000">*</span><span style="color: #000000">a</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: #000000">c</span><span style="color: #000000">*</span><span style="color: #000000">c </span><span style="color: #000000">||</span><span style="color: #000000"> a</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: #000000">*</span><span style="color: #000000">c</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: #000000"> b</span><span style="color: #000000">*</span><span style="color: #000000">b</span><span style="color: #000000">+</span><span style="color: #000000">c</span><span style="color: #000000">*</span><span style="color: #000000">c</span><span style="color: #000000">==</span><span style="color: #000000">a</span><span style="color: #000000">*</span><span style="color: #000000">a)    {      n</span><span style="color: #000000">=</span><span style="color: #800080">3</span><span style="color: #000000">;    }    </span><span style="color: #0000ff">if</span><span style="color: #000000"> (a</span><span style="color: #000000">==</span><span style="color: #000000">b </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: #000000">||</span><span style="color: #000000"> b</span><span style="color: #000000">==</span><span style="color: #000000">c)    {      n</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"> (a</span><span style="color: #000000">*</span><span style="color: #000000">a</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: #000000">c</span><span style="color: #000000">*</span><span style="color: #000000">c </span><span style="color: #000000">||</span><span style="color: #000000"> a</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: #000000">*</span><span style="color: #000000">c</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: #000000"> b</span><span style="color: #000000">*</span><span style="color: #000000">b</span><span style="color: #000000">+</span><span style="color: #000000">c</span><span style="color: #000000">*</span><span style="color: #000000">c</span><span style="color: #000000">==</span><span style="color: #000000">a</span><span style="color: #000000">*</span><span style="color: #000000">a)      {        n</span><span style="color: #000000">=</span><span style="color: #800080">5</span><span style="color: #000000">;      }    }    </span><span style="color: #0000ff">if</span><span style="color: #000000"> (a</span><span style="color: #000000">==</span><span style="color: #000000">b </span><span style="color: #000000">&&</span><span style="color: #000000"> a</span><span style="color: #000000">==</span><span style="color: #000000">c)    {      n</span><span style="color: #000000">=</span><span style="color: #800080">1</span><span style="color: #000000">;    }  }  </span><span style="color: #0000ff">else</span><span style="color: #000000">  {    n</span><span style="color: #000000">=</span><span style="color: #800080">4</span><span style="color: #000000">;  }  </span><span style="color: #0000ff">return</span><span style="color: #000000"> n;}</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;  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);  </span><span style="color: #0000ff">switch</span><span style="color: #000000"> (fun(a,b,c))  {    </span><span style="color: #0000ff">case</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">三角形为任意三角形\n</span><span style="color: #800000">"</span><span style="color: #000000">);      </span><span style="color: #0000ff">break</span><span style="color: #000000">;    </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #800080">1</span><span style="color: #000000">:      printf(</span><span style="color: #800000">"</span><span style="color: #800000">三角形为等边三角形\n</span><span style="color: #800000">"</span><span style="color: #000000">);      </span><span style="color: #0000ff">break</span><span style="color: #000000">;    </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #800080">2</span><span style="color: #000000">:      printf(</span><span style="color: #800000">"</span><span style="color: #800000">三角形为等腰三角形\n</span><span style="color: #800000">"</span><span style="color: #000000">);      </span><span style="color: #0000ff">break</span><span style="color: #000000">;    </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #800080">3</span><span style="color: #000000">:      printf(</span><span style="color: #800000">"</span><span style="color: #800000">三角形为直角三角形\n</span><span style="color: #800000">"</span><span style="color: #000000">);      </span><span style="color: #0000ff">break</span><span style="color: #000000">;    </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #800080">4</span><span style="color: #000000">:      printf(</span><span style="color: #800000">"</span><span style="color: #800000">不能构成三角形\n</span><span style="color: #800000">"</span><span style="color: #000000">);      </span><span style="color: #0000ff">break</span><span style="color: #000000">;    </span><span style="color: #0000ff">case</span><span style="color: #000000"> </span><span style="color: #800080">5</span><span style="color: #000000">:      printf(</span><span style="color: #800000">"</span><span style="color: #800000">三角形为等腰直角三角形\n</span><span style="color: #800000">"</span><span style="color: #000000">);      </span><span style="color: #0000ff">break</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></pre>
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<span style="color: #0000ff" color="#0000ff">测试结果：</span>

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<pre><div><span style="color: #000000">[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">输入数据a</span><span style="color: #000000">=</span><span style="color: #800080">12</span><span style="color: #000000">b</span><span style="color: #000000">=</span><span style="color: #800080">12</span><span style="color: #000000">c</span><span style="color: #000000">=</span><span style="color: #800080">25</span><span style="color: #000000">不能构成三角形[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">输入数据a</span><span style="color: #000000">=</span><span style="color: #800080">12</span><span style="color: #000000">b</span><span style="color: #000000">=</span><span style="color: #800080">12</span><span style="color: #000000">c</span><span style="color: #000000">=</span><span style="color: #800080">23</span><span style="color: #000000">三角形为等腰三角形</span></div></pre>
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