c++编程：求矩形面积、找质数并求和、求阶乘

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1、1.求矩形面积：（1）给定数据：#includeusingnamespacestd;classRect{public:Rect(float,float);voidArea(Rect&);floatchang;floatkuan;};Rect::Rect(floatc,floatk):chang(c),kuan(k){}voidArea(Rect&r){cout<

2、m>usingnamespacestd;classRect{public:Rect(){chang=0.0;kuan=0.0;}Input();Area();private:floatchang;floatkuan;};Rect::Input(){cin>>chang>>kuan;}Rect::Area(){cout<usingnamespacest

3、d;intisprime(intn){inti;for(i=2;iusingnamespacestd;classJi{public:voidInput();intji();intn;};voidJi::Input(){cin>>n;}intJi::

4、ji(){inti,jie=1;for(i=1;i<=n;i++){jie*=i;}returnjie;}intmain(){Jij1;cout<<"pleaseinputn:";j1.Input();cout<<"10!="<