下列程序的运行结果是 。using System;class Test{ public static void Main(){ int s=0;for(int i=1;;i++){ if(s>50) break;if(i%2==0) s+=i;}Console.WriteLine(“i,s=”+i+”,”+s);}}
时间: 2023-12-04 14:02:25 浏览: 75
该程序的运行结果为:
```
i,s=12,54
```
程序解析如下:
1. 首先定义一个 int 类型的变量 s,初始值为 0。
2. 进入 for 循环,循环变量 i 的初始值为 1,循环条件为 true,即不停地执行循环体内的语句。
3. 在循环体内,首先判断 s 是否大于 50,如果是,则使用 break 语句跳出循环。
4. 判断 i 是否为偶数,如果是,将 i 加到 s 中。
5. 输出 i 和 s 的值。
6. 当 i 的值为 12 时,s 的值为 54,满足 s 大于 50 的条件,因此跳出循环。
7. 输出结果为 i,s=12,54。
相关问题
package project05demo1; import java.util.ArrayList; import java.io.File; import java.io.FileNotFoundException; import java.util.Scanner; public class Test { public static void main(String[] args) throws FileNotFoundException, InvalidTriangleException{ start(); } public static void start() throws FileNotFoundException, InvalidTriangleException { //create an empty list of shapes and save the reference. ArrayList<Shape> ShapeList=new ArrayList<Shape>(); create(ShapeList); //Pass the reference to create method that fills the list. //create(ShapeList); } public static void create(ArrayList<Shape> ShapeList)throws FileNotFoundException,InvalidTriangleException{ //create shape objects using data from an input file. File file=new File("ShapeData.txt"); Scanner InputFile=new Scanner(file); double a,b,c; while(InputFile.hasNext()) { while(InputFile.nextLine()!="Triangle"){ String RectangleName; RectangleName=InputFile.nextLine(); a=InputFile.nextDouble(); b=InputFile.nextDouble(); ShapeList.add(new Rectangle(RectangleName,a,b)); } while(InputFile.nextLine()!="Circle") { String TriangleName; TriangleName=InputFile.nextLine(); a=InputFile.nextDouble(); b=InputFile.nextDouble(); c=InputFile.nextDouble(); ShapeList.add(new Triangle(TriangleName,a,b,c)); } while(InputFile.hasNextLine()) { String CircleName; CircleName=InputFile.nextLine(); a=InputFile.nextDouble(); ShapeList.add(new Circle(CircleName,a)); } } InputFile.close(); } public static void display(ArrayList<Shape> ShapeList) { for(int i=0;i<ShapeList.size();i++) { System.out.println(ShapeList.get(i)); } } }
这是一个Java程序,用于读取一个包含不同形状数据的文件,并创建相应的形状对象。程序包含三个类:Shape、Rectangle、Triangle和Circle。其中Shape是所有形状的基类,而Rectangle、Triangle和Circle是Shape的子类。程序使用ArrayList来存储所有创建的形状对象,并提供了一个display方法,用于打印所有形状对象的信息。
该程序还涉及到一个InvalidTriangleException异常类,用于在创建Triangle对象时检查是否为有效的三角形。程序的主方法是start方法,它调用create方法来读取文件并创建形状对象,然后调用display方法来打印形状对象的信息。
在以上代码的基础上完成:Add a class Lender that extends User. The constructor of the Lender class takes as arguments a name and the number of books lent by the user. The Lender class does not have any instance variable. Warning: the constructor of the Lender class takes as argument the number of books lent by the lender, but the book instance variable of the User class indicates how many books the user borrowed! Lending books is the same as borrowing a negative number of books. The moreBook method of the Lender class increases the number of books lent by the lender user by the number given as argument to the method (so the books borrowed by the lender becomes more negative!) Make sure you test all the methods of your new Lender class using testLender method. Here are some tests for your new Lender class: public static void testLender() { Lender l = new Lender("Anna",5); System.out.println(l.getName() == "Anna"); System.out.println(l.getBook() == -5); l.setBook(-6); System.out.println(l.getBook() == -6); l.moreBook(2); System.out.println(l.getBook() == -8); l.moreBook(-9); System.out.println(l.getBook() == 1); } Also, do not forget to modify your Test class to test the Lender class.
```
public class Lender extends User {
public Lender(String name, int booksLent) {
super(name, -booksLent);
}
public void moreBook(int num) {
setBook(getBook() - num);
}
}
public class Test {
public static void main(String[] args) {
testUser();
testLender();
}
public static void testUser() {
User u = new User("Bob", 3);
System.out.println(u.getName() == "Bob");
System.out.println(u.getBook() == 3);
u.setName("Alice");
System.out.println(u.getName() == "Alice");
u.setBook(5);
System.out.println(u.getBook() == 5);
}
public static void testLender() {
Lender l = new Lender("Anna", 5);
System.out.println(l.getName() == "Anna");
System.out.println(l.getBook() == -5);
l.setBook(-6);
System.out.println(l.getBook() == -6);
l.moreBook(2);
System.out.println(l.getBook() == -8);
l.moreBook(-9);
System.out.println(l.getBook() == 1);
}
}
```
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