137.CPP自带异常

#include <iostream>
#include <exception>
using namespace std;

//继承自带的异常
class sizeerror :public exception
{
public:
    sizeerror() :exception("尺寸大小异常")
    {

    }

    const char *what()
    {
        char *p = "尺寸大小异常";
        cout << "尺寸大小异常" << endl;
        return p;
    }
};

class print3d
{
public:
    print3d(double size)
    {
        if (size > 100)
        {
            throw &sizeerror();
        }
    }
};
void main()
{
    try
    {
        print3d p(300);
    }
    catch (sizeerror *p)
    {
        p->what();
    }
    cin.get();
}