[問題]以圓半徑解圓周長與圓面積的while迴圈寫法??

[an82114 ()]

我寫的如下  可幫我修改 需加入while 或 do while
package abc;
import java.util.*;
public class abc {

                public static void main(String[] args) {
                        float r;
                        double pi=3.14159;
                        double l, area;
                Scanner myScanner;
                myScanner = new Scanner(System.in);
                for( ; ;)
                System.out.print("請輸入半徑:");
                r=Integer.parseInt(myScanner.readLine());
                if(r <0 ) break;
                area = pi*r*r;
                l = 2*pi*r;

                System.out.println("radius="+r+'\n');

        }

        }

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※ 編輯: an82114         來自: 120.124.249.231      (10/13 00:47)