HelloWorld! I'm comming!
哈嘍CSDN!這是我的第一篇部落格,以後就讓部落格來記錄我的學習歷程吧^_^!
【1】計算半徑周長面積,使用格式識別符號保留兩位小數。
import java.util.Scanner; public class HelloWorld { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); double r; System.out.println("請輸入半徑r的長度:"); r=in.nextDouble(); double c,s; c=2*r*Math.PI; s=r*r*Math.PI; System.out.printf("周長c為:%4.2f",c); System.out.println(); System.out.printf("面積s為:%4.2f",s); } }
double型常量,PI(π)和E(自然對數的底),即Math.PI,Math.E,Math.random(),Math.max(); 格式識別符號,%4.2f;
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