C++第四章课后习题4-12

定义一个datatype类，能处理包含字符型，整形，浮点型3种类型的数据，给出其构造函数。

#include <iostream>
using namespace std;

class DataType{
    private:
        char a;
        int n;
        float x;
enum {
    character,
    integer,
    floating,
} vartype;
    public:
        DataType(char a)
        {
            vartype=character;
            this->a=a;
        }
        DataType(int n)
        {
            vartype=integer;
            this->n=n;
        }
        DataType(float x)
        {
            vartype=floating;
            this->x=x;
        }
        void print()
        {
            switch(vartype){
                case character:
                    cout<<"zifu"<<a<<endl;
                    break;
                case integer:
                    cout<<"zhengshu"<<n<<endl;
                    break;
                case floating:
                    cout<<"fudiashu"<<x<<endl;
                    break;
            }
        }
}; 
int main()
{
    DataType a('c'),b(1),c(1.44F);
    a.print();
    b.print();
    c.print();
}