初识联合类型小练习

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#include <iostream>using namespace std;struct Line{double x1, x2, y1, y2;};struct Rectangle{double left, right, top, bottom;};struct Circle{double x, y, r;};union Figure{Line line;Rectangle rectangle;Circle circle;};enum Shape { LINE, RECTANGLE, CIRCLE };struct TaggedFigure{Shape shape;Figure figure;};void input(TaggedFigure[], int);void draw(TaggedFigure);void draw_line(Line);void draw_rectangle(Rectangle);void draw_circle(Circle);int main(){const int N = 100;TaggedFigure figures[N];input(figures, N);for (int i = 0; i < N; i++)draw(figures[i]);return 0;}void input(TaggedFigure figures[], int n){for (int i = 0; i < n; i++){int shape;cout << "请输入要绘制的图形（0：线段；1：矩形；2：圆形； -1：结束）：";cin >> shape;if (shape == -1)break;switch (shape){case 0:figures[i].shape = LINE;cout << "请输入线段的起点和终点坐标(x1, y1, x2, y2)：" << endl;cin >> figures[i].figure.line.x1>> figures[i].figure.line.x2>> figures[i].figure.line.y1>> figures[i].figure.line.y2;break;case 1:figures[i].shape = RECTANGLE;cout << "请输入矩形的左上角和右下角的坐标(left, top, right, bottom)：" << endl;cin >> figures[i].figure.rectangle.left>> figures[i].figure.rectangle.top>> figures[i].figure.rectangle.right>> figures[i].figure.rectangle.bottom;break;case 2:figures[i].shape = CIRCLE;cout << "请输入圆心坐标和半径（x, y ,r）：" << endl;cin >> figures[i].figure.circle.x>> figures[i].figure.circle.y>> figures[i].figure.circle.r;break;}}}void draw(TaggedFigure figures){switch (figures.shape){case LINE:draw_line(figures.figure.line);break;case RECTANGLE:draw_rectangle(figures.figure.rectangle);break;case CIRCLE:draw_circle(figures.figure.circle);break;}}

//上述的程序中为给出draw_line、draw_rectangle以及draw_circle三个函数的实现。

参考：《程序设计教程》（陈家骏、郑滔编著）

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