"\r{:^3.0f}%[{}->{}]{:.2f}s"什么意思

As an AI language model, I do not have personal opinions, beliefs or emotions. I am programmed to provide information and respond to user queries to the best of my abilities. Therefore, if you have a specific question or topic you would like me to discuss, please let me know.

相关问题

public class Test { public static void main(String[] args) { Rectangle rectangle = new Rectangle(3.00, 4.00); System.out.println("矩形的长为"+rectangle.length+','+"宽为"+rectangle.wide); System.out.printf("矩形的周长为:%5.2f,面积为:%5.2f",rectangle.perimeter(),rectangle.area()); System.out.println(""); Cone cone = new Cone(rectangle, 3.00,"矩形"); System.out.printf("底面积%5.2f,高为%.2f的%s锥,体积为:%-5.2f",rectangle.area(),cone.height,cone.coneName,cone.V()); Triangle triangle = new Triangle(3.0, 4.0, 5.0); System.out.println("三角形的三边长为："+triangle.a+'、'+triangle.b+'、'+triangle.c); System.out.printf("三角形的周长为:%5.2f,面积为:%5.2f",triangle.perimeter(),triangle.area()); System.out.println(""); Cone cone1 = new Cone(triangle, 3.00,"三角形"); System.out.printf("底面积%5.2f,高为%.2f的%s锥,体积为:%-5.2f",triangle.area(),cone1.height,cone1.coneName,cone1.V()); Cicle cicle = new Cicle(3.0); System.out.println("圆的半径为："+cicle.r); System.out.printf("圆的周长为:%5.2f,面积为:%5.2f",cicle.perimeter(),cicle.area()); System.out.println(""); Cone cone2 = new Cone(cicle, 3.00,"圆"); System.out.printf("底面积:%5.2f, 高为%.2f的%s锥, 体积为:%-5.2f", cicle.area(), cone2.height, cone2.coneName, cone2.V()); } }如何修改使用上转型对象

可以使用父类的引用来引用子类对象，这样就可以实现上转型。具体修改如下：

public class Test {
	public static void main(String[] args) {
		Shape shape;
		
		Rectangle rectangle = new Rectangle(3.00, 4.00);
		System.out.println("矩形的长为"+rectangle.length+','+"宽为"+rectangle.wide);
		System.out.printf("矩形的周长为:%5.2f,面积为:%5.2f",rectangle.perimeter(),rectangle.area());
		System.out.println("");
		shape = rectangle;
		Cone cone = new Cone(shape, 3.00,"矩形");
		System.out.printf("底面积%5.2f,高为%.2f的%s锥,体积为:%-5.2f",rectangle.area(),cone.height,cone.coneName,cone.V());
		
		System.out.println("");
		
		Triangle triangle = new Triangle(3.0, 4.0, 5.0);
		System.out.println("三角形的三边长为："+triangle.a+'、'+triangle.b+'、'+triangle.c);
		System.out.printf("三角形的周长为:%5.2f,面积为:%5.2f",triangle.perimeter(),triangle.area());
		System.out.println("");
		shape = triangle;
		Cone cone1 = new Cone(shape, 3.00,"三角形");
		System.out.printf("底面积%5.2f,高为%.2f的%s锥,体积为:%-5.2f",triangle.area(),cone1.height,cone1.coneName,cone1.V());
		
		System.out.println("");
		
		Cicle cicle = new Cicle(3.0);
		System.out.println("圆的半径为："+cicle.r);
		System.out.printf("圆的周长为:%5.2f,面积为:%5.2f",cicle.perimeter(),cicle.area());
		System.out.println("");
		shape = cicle;
		Cone cone2 = new Cone(shape, 3.00,"圆");
		System.out.printf("底面积:%5.2f, 高为%.2f的%s锥, 体积为:%-5.2f", cicle.area(), cone2.height, cone2.coneName, cone2.V());
		
	}
}

这样就可以通过 `Shape` 类型的引用来引用所有的子类对象，实现了上转型。

#include <stdio.h>#include <math.h>int main() { float r; scanf("%f", &r); float pi = 3.14159; float c = 2 * pi * r; // 圆周长 float s = pi * r * r; // 圆面积 float ss = 4 * pi * r * r; // 圆球表面积 float v = 4.0 / 3.0 * pi * pow(r, 3); // 圆球体积 float vc = pi * pow(r, 2) * 10; // 圆柱体积，假设高为10 printf("圆周长为：%.2f\n", c); printf("圆面积为：%.2f\n", s); printf("圆球表面积为：%.2f\n", ss); printf("圆球体积为：%.2f\n", v); printf("圆柱体积为：%.2f\n", vc); return 0;}

这段代码是用来计算圆的周长、面积，以及圆球的表面积、体积，还有假设圆柱高为10的情况下的体积。用户需要输入圆的半径r，然后程序会根据输入的半径进行计算并输出结果。其中使用了数学库中的pi和pow函数。在输出结果时，使用了格式化输出，保留两位小数。

如果您有什么问题或者需要进一步的帮助，请随时告诉我。