《Double Circle》 - double circle乒乓球
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double length;double width;double a;double b;double c;System.out.println("请输入圆形半径：");Scanner sc = new Scanner(System.in);r = sc.nextDouble();double circleCircumference = circle.getCircleCircumference(...
c++类和对象求圆的面积这个问题错在哪
circle(double);改为：circle( double r = 0 );circle::show_area()改为：double circle::show_area()circle A();改为：circle A; 或者circle A( 2.2 );
