C++ 编程题库.docVIP

31．定义盒子Box类，要求具有以下成员：长、宽、高分别为x,y,z，可设置盒子形状；可计算盒子体积；可计算盒子的表面积。 #include iostream #include iostream using namespace std; class Box{ public: int weight; int length; int hight; void box_shape(int w, int l, int h); int box_volume(int w, int l, int h); int box_area(int w, int l, int h); }; int main() { Box mybox; cout Please Enter weight and length and hight:; cin mybox.weight mybox.length mybox.hight; int box_v, box_a; mybox.box_shape(mybox.weight, mybox.length, mybox.hight); box_v = mybox.box_volume(mybox.weight, mybox.length, mybox.hight); cout This boxs volume = box_v endl; box_a = mybox.box_area(mybox.weight, mybox.length, mybox.hight); cout This boxs area = box_a endl; } void Box::box_shape(int w, int l, int h) { if(w == l l == h) cout This is a Cube! endl; else cout This is a cuboid! endl; } int Box::box_volume(int w, int l, int h) { return w * l * h; } int Box::box_area(int w, int l, int h) { return 2 * w * l + 2 * l * h + 2 * w * h; } 有两个长方柱，其长、宽、高分别为：（1）30，20，10；（2）12，10，20。分别求他们的体积。编一个基于对象的程序，在类中用带参数的构造函数。 #include iostream class Box{ private: int length; int weight; int hight; public: Box(int, int, int); int volume(); }; int main() { using namespace std; Box mybox1(30, 20, 10); cout The first Boxs volume = mybox1.volume() endl; Box mybox2(12, 10, 30); cout The second Boxs volume = mybox2.volume() endl; return 0; } Box::Box(int l, int w, int h) { length = l; weight = w; hight = h; } int Box::volume() { return (hight * weight * length); } 有两个长方柱，其长、宽、高分别为：（1）12，20，25；（2）10，30，20。分别求他们的体积。编一个基于对象的程序，且定义两个构造函数，其中一个有参数，一个无参数。 #include iostream class Box{ private: int length; int wight; int height; public: Box(); Box(int, int, int); int volume(); }; int main() { using namespace std; Box mybox1; cout The first boxs volume = mybox1.volume() endl; Box mybox2(10, 30, 20); cout The second boxs volume = mybox2.volume() endl; return 0; }