4月9日上机练习

 

 

1.编写一个简单程序,要求数组长度为5,静态赋值10,20,30,40,50,在控制台输出该数组的值。

public class TEXT {
    
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] arr=new int[]{10,20,30,40,50};
        for(int i=0;i){
        System.out.print(arr[i]+" ");     
                }
            }
}

 


2.编写一个简单程序,要求数组长度为5,动态赋值10,20,30,40,50,在控制台输出该数组的值。

 
  
import java.util.Scanner;
public class TEXT {
    
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
         

        
        
                int ass [] = new int [5];
                Scanner sc = new Scanner(System.in);
                for(int i=0;i){
                    System.out.println("请输入数字");
                    ass[i] = sc.nextInt();
                }
                System.out.println("赋值结束------------");
          
          
                          
                      
                }
            }
 
  

 

 
 

 


3.编写一个简单程序,定义整型数组,里面的元素是{23,45,22,33,56},求数组元素的和、平均值

public class TEXT {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] arr ;
        arr = new int[]{23,45,22,33,56};

        int sum = 0;
        double avg;
        int max = 0;
        int min = 0;
        for(int i = 0 ;i){
            sum = sum +arr[i];
            if(arr[i]>max){
                max = arr[i];
            }if(arr[i]<min){
                min = arr[i];
            }
        }
        
        avg = sum/arr.length;
        System.out.println("数组中平均数为:"+avg);
        System.out.println("数组中和为:"+sum);


    }

}

 


4.在一个有8个整数(18,25,7,36,13,2,89,63)的数组中找出其中最大的数及其下标。

public class TEXT {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int arr1[];
        int max = 0;
        int n = 0;
        arr1 = new int[]{18,25,7,36,13,2,89,63};
        max = arr1[0];
        for(int i = 0;i){

        if(arr1[i]>max){
                max = arr1[i];
                n = i;
            }
        }
        System.out.println("最大的数为"+max+",其下标为 "+n);

    }

}



5. 将一个数组中的元素逆序存放(知识点:数组遍历、数组元素访问)

import java.util.Scanner;
public class TEXT {
    
    
    public static void main(String[] args) {
    
                Scanner s = new Scanner(System.in);
                System.out.println("请输入数组长度");
                int a = s.nextInt();
                int b[] = new int[a];
                for (int i = 0; i < b.length; i++) {
                    System.out.println("请输入第" + (i + 1) + "个元素");
                    b[i] = s.nextInt();
                }
                System.out.println("排序前:");
                for (int i = 0; i < b.length; i++) {
                    System.out.print(b[i] + "\t");
                }
                System.out.println();
                int temp;
                // 正序排序
                for (int i = 0; i < b.length - 1; i++) {
                    for (int j = b.length - 1; j > i; j--) {
                        if (b[j] < b[j - 1]) {
                            temp = b[j];
                            b[j] = b[j - 1];
                            b[j - 1] = temp;
                        }
                    }
                }
                System.out.println("排序后:");
                for (int i = 0; i < b.length; i++) {
                    System.out.print(b[i] + "\t");
                }
                // 逆序排序
                for (int i = 0; i < b.length - 1; i++) {
                    for (int j = b.length - 1; j > i; j--) {
                        if (b[j] > b[j - 1]) {
                            temp = b[j - 1];
                            b[j - 1] = b[j];
                            b[j] = temp;
                        }
                    }
                }
                System.out.println();
                System.out.println("逆序排出:");
                for (int i = 0; i < b.length; i++) {
                    System.out.print(b[i] + "\t");
                }
                s.close();
            }
        }
            
 
  

 






 6、有一个已经排好序的数组。现输入一个数,要求按原来的规律将它插入数组中。(附加题)

public class TEXT {
    
    
    public static void main(String[] args) {
        
                int[] shu = {1,2,7,9};//原数组
                int[] shu2 = new int[5];//输出数组
                int a = 3;//要插入的数
                for(int i =0; i< shu.length; i++){
                    if(shu[i] > a){
                        shu2[i] = a;
                        for(i = i + 1; i < shu2.length; i++ ){
                            shu2[i] = shu[i-1];

                            //System.out.println(shu2[i]);
                        }
                    }
                    else{
                        shu2[i] = shu[i];
                    }
                }
                //循环输出
                for(int i = 0; i<5; i++){
                    System.out.println(shu2[i]);
                }
            }
        }

 

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