《Java程序设计案例教程（微课版）》实验五 while与do-while语句.docx

实验五 while与do-while语句一、实验目的1、掌握while与do-while语句的结构；2、掌握简单的循环设计方法。二、实验内容1、分别使用while, do-while语句实现求1100的和。源程序：public class Main public static void main(String args) int sum =0, i = 1;while (i < 101) sum += i;i+；)System.out.printIn(sum);sum = 0;i = 1；do sum += i;i+； while (i < 101);System.out.printIn(sum);)2、实现求5!源程序：public class Main public static void main(String args) long j=ll;for(int i=l;i<6;i+) J*=1J)System.out.println(j);)3、实现求该数列前20项的和：1, 1, 2, 3, 5, 8, 13, 21, 34, 源程序：public class Main public static void main(String args) int tl = 1, t2 = 1, t3 = 0;for (int i = 1; i < 19; i+) t3 = tl + t2;tl = t2；t2 = t3；)System.out.println(t3); )4、从键盘输入若干个学生成绩，计算出平均成绩。当输入分数为负数时，表示输入结束。 源程序：import java.util.Scanner;public class Main public static void main(String args) Scanner sc = new Scanner(System.in);double h = 0;int i = 0;double p = 0;while (true) System. out .printin ("请输入：”)；double a = sc.nextDouble();if (a >= 0) i+；h += a; else System. out. print In (Mn);break;)p = h / i;("平均数为"+ p);sc.close();)5、猜数游戏：让用户猜数，一直到猜对为止。在最后提示是猜了几次猜对的。 源程序：import java.util.Scanner;public class Main public static void main(String args) int t = 0;Scanner sc = new Scanner(System.in);int a = (int) (Math.randow() * 100) + 1;("系统以施机生成1-100,请猜这个数是多少“); while (true) t+;System. out.print In ("你猜的这个数是：");int b = sc.nextlnt();if (a > b) System . out. print In (“猜小了 ”); else if (a < b) System, out. printin("猜大了”); else System.out. printin("恭喜你猜对了”); break;)("你一共猜了“ + t + “次”)； sc.close();)三、实验总结