数组

今天学了数组主要是一维数组和二维数组

一维数组：

 

一个练习题，源代码在后面

5

请输入学生成绩

74

56

89

41

89

最高成绩为：74

最高成绩为：74

最高成绩为：89

最高成绩为：89

最高成绩为：89

student 0 score is 74 is B

student 1 score is 56 is D

student 2 score is 89 is A

student 3 score is 41 is D

student 4 score is 89 is A

 

import java.util.Scanner;

public class HelloWorld {

          public static void main(String[] args) {

               System.out.println("请输入学生数");

               Scanner stu = new Scanner(System.in);

               int n = stu.nextInt();

               int arr[];

               arr=new int[1000] ;

               System.out.println("请输入学生成绩");

               for(int i=0;i<n;i++)

               {

                   arr[i]=stu.nextInt();

               }

               int temp=0;

               for(int i=0;i<n;i++)

               {

                  

                   if(arr[i]>temp)

                   {

                        temp=arr[i];

                   }   

                        System.out.println("最高成绩为："+temp);

               }

               for(int i=0;i<n;i++)

               {

                   if(arr[i]>=temp-10)

                   {

                        System.out.printf("student "+ i);

                        System.out.printf(" score is "+ arr[i]);

                        System.out.println(" is A");

                       

                   }

                   else if(arr[i]>=temp-20)

                   {

                        System.out.printf("student "+ i);

                        System.out.printf(" score is "+ arr[i]);

                        System.out.println(" is B");

                   }

                   else if(arr[i]>=temp-30)

                   {

                        System.out.printf("student "+ i);

                        System.out.printf(" score is "+ arr[i]);

                        System.out.println(" is C");

                   }

                   else

                   {

                        System.out.printf("student "+ i);

                        System.out.printf(" score is "+ arr[i]);

                        System.out.println(" is D");

                   }

               }

              

               }

}

 

 

二维数组：

杨辉三角：10行

import java.util.Scanner;

public class HelloWorld {

          public static void main(String[] args) {

               int[][]arr = new int[10][10] ;

               for(int i=0;i<arr.length; i++)

               {

                   for(int j=0;j<=i;j++)

                   {

                        if(j==0||j==i)

                        { arr[i][j]=1;}

                        else

                        {arr[i][j]=arr[i-1][j-1]+arr[i-1][j];}

                       System.out.print(arr[i][j]+"\t");

                   }

                   System.out.println();

               }

              

               }

}

 

1    

1    1    

1    2    1    

1    3    3    1    

1    4    6    4    1    

1    5    10   10   5    1    

1    6    15   20   15   6    1    

1    7    21   35   35   21   7    1    

1    8    28   56   70   56   28   8    1    

1    9    36   84   126  126  84   36   9    1