python 版本

class Cuboid:

def __init__(self, length, width, high):

# data must > 0

if length <= 0:

raise ValueError("length <= 0!")

if width <= 0:

raise ValueError("width <= 0!")

if high <= 0:

raise ValueError("high <= 0!")

# save the data

self.__length = length

self.__width = width

self.__high = high

# caculate and save the surface area and volume

self.__area = float(2 * (self.__length * self.__width + self.__width * self.__high + self.__high * self.__length))

self.__volume = float(self.__length * self.__width * self.__high)

def get_area(self):

return self.__area

def get_volume(self):

return self.__volume

if __name__ == '__main__':

length = float(input("Please enter the length: "))

width = float(input("Please enter the width: "))

high = float(input("Please enter the high: "))

TestCuboid = Cuboid(length, width, high)

print("Surface area is: ", TestCuboid.get_area())

print("Volume is: ", TestCuboid.get_volume())

测试结果

cpp 版本：

头文件 cuboid.h：

class Cuboid

{

public:

Cuboid(float length, float width, float high);

~Cuboid();

// get surface area

float get_area();

// get volume

float get_volume();

private:

float Length_, Width_, High_, Area_, Volume_;

};

源文件

cuboid.cpp:

#include "cuboid.h"

Cuboid::Cuboid(float length, float width, float high)

{

if (length <= 0)

{

throw "ValueError: length <= 0!";

}

if (width <= 0)

{

throw "ValueError: width <= 0!";

}

if (high <= 0)

{

throw "ValueError: high <= 0!";

}

// save the data

Length_ = length;

Width_ = width;

High_ = high;

// calculate the surface area and volume

Area_ = 2 * (Length_ * Width_ + Width_ * High_ + High_ * Length_);

Volume_ = Length_ * Width_ * High_;

}

Cuboid::~Cuboid(){}

float Cuboid::get_area()

{

return Area_;

}

float Cuboid::get_volume()

{

return Volume_;

}

main.cpp:

#include

#include

int main()

{

float Length, Width, High;

std::cout<

std::cin>>Length;

std::cout<

std::cin>>Width;

std::cout<

std::cin>>High;

try

{

Cuboid TestCuboid(Length, Width, High);

std::cout<

std::cout<

}

catch (char const* e)

{

std::cout<

}

return 0;

}

测试结果：