枚举、结构体、联合体的简单应用程序-C语言

向右看齐 2022-06-06 11:58 242阅读 0赞

#include <stdio.h>
    
    //图元的类型
    enum SHAPE_TYPE{
        RECT_TYPE = 0,
        CIRCLE_TYPE = 1,
        TRIANGLE_TYPE = 2,
        SHAPE_NUM,
    };
    //为了定义三角形的坐标而设
    struct point{
        float x;
        float y;
    };
    //创建shape结构体
    struct shape{
        //int type;
        enum SHAPE_TYPE type;
        union {
            struct {
                float x;
                float y;
                float w;
                float h;
            }rect;
    
            struct {
                float c_x;
                float c_y;
                float r;
            }circle;
    
            struct {
                struct point t0;
                struct point t1;
                struct point t2;
            }triangle;
        }u;
    };
    //初始化矩形
    void init_rect_shape(struct shape *s, float x, float y, float w, float h)
    {
        s->type = RECT_TYPE;
        s->u.rect.x = x;
        s->u.rect.y = y;
        s->u.rect.w = w;
        s->u.rect.h = h;
        return ;
    }
    //初始化三角形
    void init_triangle_shape(struct shape *s,float a, float b, float c, float d,float e, float f)
    {
        s->type = TRIANGLE_TYPE;
        s->u.triangle.t0.x = a;
        s->u.triangle.t0.y = b;
        s->u.triangle.t1.x = c;
        s->u.triangle.t1.y = d;
        s->u.triangle.t2.x = e;
        s->u.triangle.t2.y = f;
        return ;
    }
    //初始化圆
    void init_circle_shape(struct shape *s, float a, float b, float r)
    {
        s->type = CIRCLE_TYPE;
        s->u.circle.c_x = a;
        s->u.circle.c_y = b;
        s->u.circle.r = r;
        return;
    }
    //输出图形
    void draw_shape(struct shape *shapes, int count)
    {
        int i = 0;
        for(i=0;i<count;i++)
        {
            switch(shapes[i].type)
            {
                case CIRCLE_TYPE:
                    printf("circle:%f, %f, %f\n", shapes[i].u.circle.c_x, shapes[i].u.circle.c_y, shapes[i].u.circle.r);
                    break;
                case TRIANGLE_TYPE:
                    printf("triangle:%f, %f, %f, %f, %f, %f\n", shapes[i].u.triangle.t0.x, shapes[i].u.triangle.t0.y, shapes[i].u.triangle.t1.x, shapes[i].u.triangle.t1.y, shapes[i].u.triangle.t2.x, shapes[i].u.triangle.t2.y);
                    break;
                case RECT_TYPE:
                    printf("circle:%f, %f, %f, %f\n", shapes[i].u.rect.x, shapes[i].u.rect.y, shapes[i].u.rect.w, shapes[i].u.rect.h);
                    break;
                default:
                    break;
            }
        }
    
        return ;
    }
    
    int main()
    {
        struct shape shape_set[3];
        init_rect_shape(&shape_set[0], 100, 200, -100, 200);
        init_triangle_shape(&shape_set[1], 10, 20, 30, -30, 40, -40);
        init_circle_shape(&shape_set[2], 100, 200, 300);
        draw_shape(shape_set, 3);
    
        return 0;
    }