public class Circle {
private static double π=3.14;
private static double s;
public static void main(String[] args) {
Scanner scanner=new Scanner(System.in);
Circle circle=new Circle();
while(true){
double r=scanner.nextDouble();
s=circle.sCircle(r);
System.out.println("圓面積:"+s);
}
}
public static double sCircle(double r){
return π*r*r;
}
}
結果:
1
圓面積:3.14
2
圓面積:12.56
3
圓面積:28.259999999999998