（1）下面设计一个三角形类，请给出各成员函数的定义
<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">class Triangle{<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span>: <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">setABC</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">double</span> x, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">double</span> y, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">double</span> z);<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//置三边的值，注意要能成三角形</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">double</span> perimeter();<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//计算三角形的周长</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">double</span> area();<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//计算并返回三角形的面积</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span>: <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">double</span> a,b,c; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//三边为私有成员数据</span>};<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> main(){ Triangle tri1; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//定义三角形类的一个实例（对象）</span> tri1.setABC(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">5</span>,<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">6</span>); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//为三边置初值</span> cout<<<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"三角形的周长为："</span><< tri1.perimeter()<<<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'\t'</span><<<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"面积为："</span><< tri1.area()<<endl; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>;}</code><p><code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//请在下面定义Triangle类中的各个成员函数</span></code><code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"></span></code><code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"></code><pre name="code" class="cpp">#include<iostream>#include<cstdlib>#include<Cmath>using namespace std;class Triangle{public: void setABC(double x, double y, double z);//置三边的值，注意要能成三角形 double perimeter();//计算三角形的周长 double area();//计算并返回三角形的面积private: double a,b,c; //三边为私有成员数据};int main(){ Triangle tri1; //定义三角形类的一个实例（对象） tri1.setABC(4,5,6); //为三边置初值 cout<<"三角形的周长为："<< tri1.perimeter()<<'\t'<<"面积为："<< tri1.area()<<endl; return 0;}//请在下面定义Triangle类中的各个成员函数void Triangle::setABC(double x, double y, double z){ if(x+y>z&&x+z>y&&y+z>x) { a=x; b=y; c=z; } else { cout<<"无法构成三角形"<<endl; exit(0); }}double Triangle::perimeter(void){ return a+b+c;}double Triangle::area(void){ double p=(a+b+c)/2; return sqrt(p*(p-a)*(p-b)*(p-c));}![]()
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