第四次java作业

1.编写程序, 输入变量x的值,如果是1,输出x=1,如果是5,输出x=5,如果是 10,输出
x=10,除了以上几个值,都输出x=none。

package pra;
import java.util.Scanner;
public class Text1 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入x的值:");
        int x = input.nextInt();
        if (x == 1) {
            System.out.println("x=1");
        } else if(x == 5) {
            System.out.println("x=5");
        } else if(x == 10) {
            System.out.println("x=10");
        } else {
            System.out.println("x=none");
        }
        

    }

}

2.用switch结构实现第1题

package pra;
import java.util.Scanner;
public class Text1 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入x的值:");
        int x = input.nextInt();
        switch (x) {
        case 1:
            System.out.println("x=1");
            break;
        case 5:
            System.out.println("x=5");
            break;
        case 10:
            System.out.println("x=10");
            break;
        default:
            System.out.println("x=none");
        }

    }

}

3.判断一个数字是否能被5和6同时整除(打印能被5和6整除),或只能被5整除(打印能被5整 除),或只能被6整除,(打印能被6整除),不能被5或6整除,(打印不能被5或6整除)

package pra;

public class Text1 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        for(int i = 1; i <= 100; i++ ) {
            if (i % 5 == 0 && i % 6 == 0) {
                System.out.println(i + "可以被5和6同时整除");
            } else if(i % 5 == 0 && i % 6 != 0) {
                System.out.println(i + "只能被5整除");
            } else if(i % 6 == 0 && i % 5 != 0) {
                System.out.println(i + "只能被6整除");
            } else if(i % 6 != 0 && i % 5!= 0) {
                System.out.println(i + "不能被5和6整除");
            } 
        }
        
    }

}

4.输入一个0~100的分数,如果不是0~100之间,打印分数无效,根据分数等级打印 A(90-100),B(80-89),C,D,E(知识点:条件语句if else if)

package pra;
import java.util.Scanner;
public class Text1 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入分数:");
        int x = input.nextInt();
        if(x > 100){
            System.out.println("输入的值无效");
        }else if(x >= 90){
            System.out.println("A级别");
        }else if(x >= 80){
            System.out.println("B级别");
        }else if(x >= 70){
            System.out.println("C级别");
        }else if(x >= 60){
            System.out.println("D级别");
        }else if(x < 60){
            System.out.println("E级别");
        
        }
        
    }

}

5.输入三个整数x,y,z,请把这三个数由小到大输出(知识点:条件语句

package pra;
import java.util.Scanner;
public class Text1 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
         Scanner input = new Scanner(System.in);
            System.out.print("请输入第一个数X:");
            int a = input.nextInt();
            System.out.println();
            System.out.print("请输入第二个数Y:");
            int b = input.nextInt();
            System.out.println();
            System.out.print("请输入第三个数Z:");
            int c = input.nextInt();
            if(a>b&&b>c){
                System.out.println(c+"<"+b+"<"+a);
            }else if(a>c&&c>b){
                System.out.println(b+"<"+c+"<"+a);
            }else if(b>a&&a>c){
                System.out.println(c+"<"+a+"<"+b);
            }else if(b>c&&c>a){
                System.out.println(a+"<"+c+"<"+b);
            }else if(c>a&&a>b){
                System.out.println(b+"<"+a+"<"+c);
            }else if(c>b&&b>a){
                System.out.println(a+"<"+b+"<"+c);
            }
        
    }

}

posted @ 2020-03-26 12:19  三好学生·  阅读(125)  评论(0编辑  收藏  举报