写一个程序，定义抽象基类Shape，由它派生出3个派生类：Circle(圆形)、Square(正方形)、Rectangle(矩形)。利用指针、虚函数printArea()、printLength()分别输出以上三者的面积和周长，三个图形的数据在定义对象时给定。另外实现一个通用的函数计算面积和周长，而不需要考虑是何种图形

好的，下面是实现了你提出的需求的C++代码：

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

class Shape {
public:
    virtual double getArea() = 0;
    virtual double getLength() = 0;
    virtual void printArea() = 0;
    virtual void printLength() = 0;
};

class Circle :public Shape {
public:
    Circle(double r) :radius(r) {}
    double getArea() { return radius * radius * 3.1415; }
    double getLength() { return 2 * radius * 3.1415; }
    void printArea() { cout << "圆的面积为：" << getArea() << endl; }
    void printLength() { cout << "圆的周长为：" << getLength() << endl; }
private:
    double radius;
};

class Square :public Shape {
public:
    Square(double s) :side(s) {}
    double getArea() { return side * side; }
    double getLength() { return 4 * side; }
    void printArea() { cout << "正方形的面积为：" << getArea() << endl; }
    void printLength() { cout << "正方形的周长为：" << getLength() << endl; }
private:
    double side;
};

class Rectangle :public Shape {
public:
    Rectangle(double l, double w) :length(l), width(w) {}
    double getArea() { return length * width; }
    double getLength() { return 2 * (length + width); }
    void printArea() { cout << "矩形的面积为：" << getArea() << endl; }
    void printLength() { cout << "矩形的周长为：" << getLength() << endl; }
private:
    double length;
    double width;
};

double getTotalArea(Shape** arr, int n) {
    double total = 0;
    for (int i = 0; i < n; i++) {
        total += arr[i]->getArea();
    }
    return total;
}

double getTotalLength(Shape** arr, int n) {
    double total = 0;
    for (int i = 0; i < n; i++) {
        total += arr[i]->getLength();
    }
    return total;
}

int main() {
    Shape* shapes[3];
    shapes[0] = new Circle(2.5);
    shapes[1] = new Square(4.0);
    shapes[2] = new Rectangle(3.0, 4.0);

    for (int i = 0; i < 3; i++) {
        shapes[i]->printArea();
        shapes[i]->printLength();
    }

    cout << "总面积为：" << getTotalArea(shapes, 3) << endl;
    cout << "总周长为：" << getTotalLength(shapes, 3) << endl;

    for (int i = 0; i < 3; i++) {
        delete shapes[i];
    }

    return 0;
}

程序中定义了一个抽象基类Shape，有3个派生类：Circle、Square和Rectangle，分别表示圆形、正方形和矩形。每个派生类都实现了Shape类中的纯虚函数，分别计算图形的面积和周长，并输出结果。同时，还实现了两个通用函数getTotalArea()和getTotalLength()，分别计算所有图形的总面积和总周长。在main()函数中，分别创建3个Shape对象，并调用它们的函数输出结果。最后，清除所有对象并返回0。