第二次作业（个人项目实践）

一

package A;
 import java.util.Scanner;//用于java输入语句的包。
 
 public class a {
      public static void main(String[]args)
        {   
          int[] arr={-2574,-4010,8243,771,2447,-5197,2556,8044,3314,3617,6065,-2817,3131,6318,2186,-113,629,-2582,-37,-1520,164,2055,-5936,5912,1717,5988,4781,5757,892,-4394,8034,2213,-1080,-2080,5364,106,2657,566,3940,-5116,4583,1806,6555,2621,-7197,528,1626,18,1049,6243,3198,4397,-1325,9087,936,-6291,662,-178,135,-3473,-2385,-165,1713,-7949,-4234,1138,2212,104,6968,-3632,3801,1137,-1296,-1215,4272,6223,-5922,-7723,7044,-2938,-8180,1356,1159,-4022,-3713,1158,-8715,-4081,-2541,-2555,-2284,461,940,6604,-3631,3802,-2037,-4354,-1213,767};
          int sum=0;
          Scanner sc = new Scanner(System.in) ;//定义Scanner类的对象sc,接收来自键盘的数据
          System.out.println("开始x:");
          int start=sc.nextInt();
          System.out.println("结束y:");
          int end=sc.nextInt();
          System.out.println("str为：" +start);
          System.out.println("end为：" +end);
          System.out.println("第"+start+"个元素到第"+end+"个元素相加和为");
          for(int i=start;i<=end;i++)
          sum+=arr[i]; 
          System.out.println(arr[start - 1] + "+...+" + arr[end - 1] + "=" + sum);
           
        }     
 }

实验结果 ：

二

package aa;

import java.util.Scanner;

public class b {

public static void main(String[]args){

int[][] arr={{-2574,-4010,8243,771,2447,-5197,2556,8044,3314,3617,6065,-2817,3131,6318,2186,-113,629,
    -2582,-37,-1520,164,2055,-5936,5912,1717,5988,4781,5757,892,-4394,8034,2213,-1080,-2080,5364,106,
    2657,566,3940,-5116,4583,1806,6555,2621,-7197,528,1626,18,1049,6243,3198,4397,-1325,9087,936,-6291,
    662,-178,135,-3473,-2385,-165,1713,-7949,-4234,1138,2212,104,6968,-3632,3801,1137,-1296,-1215,4272,
    6223,-5922,-7723,7044,-2938,-8180,1356,1159,-4022,-3713,1158,-8715,-4081,-2541,-2555,-2284,461,940,
    6604,-3631,3802,-2037,-4354,-1213,767},{2740,-4182,-5632,-2966,-1953,567,-8570,1046,2211,1572,-2503,
        -1899,3183,-6187,3330,3492,-464,-2104,316,8136,470,50,466,-1424,5809,2131,6418,-3018,6002,-8379,
        1433,1144,2124,1624,-602,-5518,5872,870,-5175,-3961,-427,-6284,2850,481,6175,141,-766,-1897,-748,
        -4248,366,4823,3003,1778,3256,2182,2253,5076,5540,-2650,2451,-1875,5482,-6881,-329,-969,-8032,-2093,
        612,1524,-5492,5758,-7401,-5039,3241,6338,3581,4321,-1072,4942,2131,210,-7045,-7514,7450,-1142,
        -2666,-4485,-639,2121,-5298,-3805,-1686,-2520,-1680,2321,-4617,-1961,2076,7309}};

int sum=0;
Scanner bb = new Scanner(System.in);
System.out.println("开始x:");
int startI = bb.nextInt();
System.out.println("结束y:");
int endI = bb.nextInt();
System.out.println("开始x:");
int startJ = bb.nextInt();
System.out.println("结束y:");
int endJ = bb.nextInt();
System.out.println("第" + startI + "列第" + startJ + "行到第" + endI + "列第"
        + endJ + "行的和为：");

for (int i = startI - 1; i < endI; i++)
{
    for (int j = startJ - 1; j < endJ ; j++)
    {
        sum += arr[i][j];
    }
}
System.out.println(arr[startI - 1][startJ - 1] + "+...+"
        + arr[endI - 1][endJ - 1] + "=" + sum);
}
}

实验结果：

总结：

这次作业对我来说是一次大的进步，以前要写代码一看就很晕，总有自己写不了的心理。这次，通过舍友的帮助下，完成了作业，

第三次作业有点难，我还不会写，希望老师见谅。我觉得老师布置这些作业对我们帮助很大，能很好的锻炼我们的能力，通过这次

作业，了解了自己的能力。找到了很多不足，但在同学和老师的帮助下，自己学到了很多。再写三维的那道题时，觉得自己需要学

的还有很多（因为三维的做不出来）。这次作业让我感受到了编程的美，所以在将来的作业中，希望我们都会不断进步，希望在将来

的作业上我会做的更好。