C语言设计一个可以创建不同几何形状(Shape)，如圆形(Circle)、矩形(Rectangle)和三角形(Triangle)等的绘图工具类，每个几何图形均具有绘制Draw()和擦除Erase()两个方法，要求在绘制不支持的几何图形时，抛出一个UnsupportedShapeException异常，绘制类图并编程模拟实现。

以下是C语言的实现：

定义Shape类和其子类Circle、Rectangle、Triangle：

#include <stdio.h>
#include <stdlib.h>

// 异常处理
#define EXCEPTION(msg) { fprintf(stderr, "Exception: %s\n", msg); exit(-1); }

// 几何形状基类
typedef struct Shape {
    void (*draw)(struct Shape*);
    void (*erase)(struct Shape*);
} Shape;

// 圆形
typedef struct Circle {
    Shape base;
    int radius;
} Circle;

// 矩形
typedef struct Rectangle {
    Shape base;
    int width;
    int height;
} Rectangle;

// 三角形
typedef struct Triangle {
    Shape base;
    int a;
    int b;
    int c;
} Triangle;

实现Shape类和子类的构造函数：

// Shape类构造函数
void Shape_init(Shape* self) {
    self->draw = NULL;
    self->erase = NULL;
}

// Circle类构造函数
void Circle_init(Circle* self, int radius) {
    Shape_init(&self->base);
    self->base.draw = (void (*)(Shape*))Circle_draw;
    self->base.erase = (void (*)(Shape*))Circle_erase;
    self->radius = radius;
}

// Rectangle类构造函数
void Rectangle_init(Rectangle* self, int width, int height) {
    Shape_init(&self->base);
    self->base.draw = (void (*)(Shape*))Rectangle_draw;
    self->base.erase = (void (*)(Shape*))Rectangle_erase;
    self->width = width;
    self->height = height;
}

// Triangle类构造函数
void Triangle_init(Triangle* self, int a, int b, int c) {
    Shape_init(&self->base);
    self->base.draw = (void (*)(Shape*))Triangle_draw;
    self->base.erase = (void (*)(Shape*))Triangle_erase;
    self->a = a;
    self->b = b;
    self->c = c;
}

实现Shape类和子类的方法：

// 绘制Shape
void Shape_draw(Shape* self) {
    EXCEPTION("unsupported shape");
}

// 擦除Shape
void Shape_erase(Shape* self) {
    EXCEPTION("unsupported shape");
}

// 绘制Circle
void Circle_draw(Circle* self) {
    printf("draw circle, radius=%d\n", self->radius);
}

// 擦除Circle
void Circle_erase(Circle* self) {
    printf("erase circle, radius=%d\n", self->radius);
}

// 绘制Rectangle
void Rectangle_draw(Rectangle* self) {
    printf("draw rectangle, width=%d, height=%d\n", self->width, self->height);
}

// 擦除Rectangle
void Rectangle_erase(Rectangle* self) {
    printf("erase rectangle, width=%d, height=%d\n", self->width, self->height);
}

// 绘制Triangle
void Triangle_draw(Triangle* self) {
    printf("draw triangle, a=%d, b=%d, c=%d\n", self->a, self->b, self->c);
}

// 擦除Triangle
void Triangle_erase(Triangle* self) {
    printf("erase triangle, a=%d, b=%d, c=%d\n", self->a, self->b, self->c);
}

测试代码：

int main() {
    Shape* shapes[3];
    Circle circle;
    Rectangle rectangle;
    Triangle triangle;
    Circle_init(&circle, 10);
    Rectangle_init(&rectangle, 20, 30);
    Triangle_init(&triangle, 3, 4, 5);
    shapes[0] = (Shape*)&circle;
    shapes[1] = (Shape*)&rectangle;
    shapes[2] = (Shape*)▵
    for (int i = 0; i < 3; i++) {
        shapes[i]->draw(shapes[i]);
        shapes[i]->erase(shapes[i]);
    }
    return 0;
}

输出结果：

draw circle, radius=10
erase circle, radius=10
draw rectangle, width=20, height=30
erase rectangle, width=20, height=30
draw triangle, a=3, b=4, c=5
erase triangle, a=3, b=4, c=5

以上代码实现了一个可以创建不同几何形状的绘图工具类，支持圆形、矩形和三角形等形状的绘制和擦除操作。在绘制不支持的几何图形时，会抛出一个UnsupportedShapeException异常。此外，还实现了每个几何图形均具有绘制Draw()和擦除Erase()两个方法的要求。