华恩JAVA班第7天
java中的循环结构,今天看书学习了三种循环结构while ， do while ， 和for ，编了三段程序
1.while：while(<条件>){<语句;>}
import java.util.*; public class Test { public static void main(String[] args) { Scanner in = newScanner(System.in); System.out.println("请输入该班学员总人数"); int a = in.nextInt(); System.out.println("该班总人数为："+a); int i=1; int sum=0; int average; while (i <=a){ System.out.println("请输入学号"+i+"的成绩"); int b =in.nextInt(); System.out.println("学员"+i+"的成绩为："+b); i++; sum = sum +b; } average = sum / a; System.out.println("该班学员的平均成绩为："+average); } }
2.do...while:do{<语句;>}while(<条件>);
import java.util.*; public class Test { public static void main(String[] args) { Scanner in = newScanner(System.in); int a =(int)(Math.random()*101); System.out.println("猜猜电脑生成的数字（0~100）"); int b; do{ b =in.nextInt(); if (a> b){ System.out.println("呜呜呜....小了，再猜"); }else if (a< b){ System.out.println("呜呜呜....大了，再猜"); }else { System.out.println("恭喜你猜对了"); } } while (a != b); } }
3.for:for（表达式1；表达式2；表达式3；）{循环体}
import java.util.*; public class Test { public static void main(String[] args){ Scanner in = new Scanner(System.in); System.out.print("请输入几门课："); int n = in.nextInt(); System.out.print("请输入学生姓名："); String name = in.next(); int i; int sum = 0; for(i = 1;i <= n;i ++){ System.out.print("请输入第"+i+"门课的成绩："); int score = in.nextInt(); sum = sum + score; } System.out.println(name+"的平均分是:"+sum / n); } }