Java第四次作业

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。(知识点:if条件语句)
package com.itheima01;
import java.util.Scanner;
public class HelloWorld {
    public static void main(String[] args) {
         Scanner sc=new Scanner(System.in); 
         System.out.println("请输入一个数字:");
         int x=sc.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 com.itheima01;
import java.util.Scanner;
public class Day01 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
         Scanner sc=new Scanner(System.in); 
         System.out.println("请输入一个数字:");
         int x=sc.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 com.itheima01;
import java.util.Scanner;
public class Day01 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc=new Scanner(System.in);
        System.out.print("请输入数字:");
        int x=sc.nextInt();
        if(x%5==0&&x%6==0){
            System.out.println(x+"能被5和6整除");
        }else if(x%5==0){
            System.out.println(x+"能被5整除");
        }else if(x%6==0){
            System.out.println(x+"能被整除");
        }else{
            System.out.println(x+"不能被5或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 elseif)
package com.itheima01;
import java.util.Scanner;
public class HelloWorld {
    public static void main(String[] args) {
         
        
          System.out.println("输入分数");
          Scanner sc=new
                  Scanner(System.in);
          int mark=sc.nextInt();
         if(mark>100||mark<0){
             System.out.println("该数不存在!!");
         }else if(mark>=90&&mark<=100){
            System.out.println("A");
         }else if(mark<90&&mark>=80){
             System.out.println("B");
         } else if(mark<80&&mark>=70){
             System.out.println("C");
         }else if(mark<70&&mark>=60){
             System.out.println("D");
         }else if(mark<60){
             System.out.println("E");
         }
    }
}

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 com.itheima01;
import java.util.Scanner;
public class HelloWorld {
    public static void main(String[] args) {
         
        
          System.out.println("请输入三个整数");
          Scanner input=new Scanner(System.in);
          int a=input.nextInt();
          int b=input.nextInt();
          int c=input.nextInt();
          System.out.println("比较前:a=" + a + ",b=" + b +",c=" + c);
          int temp;
          if(a>b){
              temp=a;
              a=b;
              b=temp;
          }
          if(a>c){
              temp=b;
              b=c;
              c=temp;
          }
          if(b>c){
              temp=b;
              b=c;
              c=temp;
          }
            System.out.println("比较后:a=" + a + ",b=" + b +",c=" + c);       
    }
}

 
原文地址:https://www.cnblogs.com/zhangjiatong/p/12573688.html