如何计算二维数组的特定部分？

Question

我无法让我的数组总结出特定的部分。

以下是我的课程说明：

编写一个程序来准备公司销售报告•该程序要求用户输入一周内三种产品的每日销售额。对3种产品和7天使用双2D阵列展示每种产品的销售额。然后，程序计算并显示以下内容：•一周内所有三种产品的销售总额。•所有产品的日平均销售额。•每种产品一周的销售总额。使用1D阵列保存每个产品的总销售额。•每种产品的日平均销售额周末所有产品的销售总额（假设第六天和第七天分别为周六和周日）•周末销售的平均值。

这就是我的代码：

*import java.util.Scanner;
import java.util.Arrays;
public class AprilSales {
 public static void main (String[] args){ 
    Scanner scnr=new Scanner(System.in);
     int [] days={1, 2, 3, 4 , 5, 6, 7};
     int p[] product={1, 2, 3};
    double sales1[][]=new double[1][7];
    
      for(int i=0;i< sales.length;i++){
        for(int j=0;j<sales[0].length;j++){
            System.out.print("Enter the sales of Product " + product[i] + " on day " 
            + days[j] + ": ");
            sales[i][j] = scnr.nextDouble();
        }
         System.out.print("\n");
    }

    //DISPLAY
    System.out.println("Display the sales of each product: " +       "\n");
    //DISPLAY
    for(int i=0;i< sales.length;i++){
        for(int j=0;j<sales[0].length;j++){
            System.out.print("The sales of Product " +  product[i] + " on day " + 
            days[j] + ": $" +sales[i][j] + "\n");

        }
         System.out.print("\n");
    }
   
           
    //SUM//
      
     
    for(int i=0;i<sales3.length;i++){
        for(int j=0;j<sales3.length;j++){
         System.out.println("Sales total of all products for one week: $"
        + sales3 );
        }
    }
    System.out.println("Sales total of all products for one week: $" + sales3);
    
    double sum=0;
    for(int i=0;i<sales1.length;i++){
        for(int j=0;j<sales1[0].length;j++){
        sum=sum +sales1[i][j];
        }
    }
    System.out.println("Sales total of product 1: $" + sum); 
    
    
    for(int i=0;i<sales2.length;i++){
        for(int j=0;j<sales2[0].length;j++){
        sum=sum +sales2[i][j];
        }
    }
    System.out.println("Sales total of product 2: $" + sum); 
}*

Answer 1

int sums = new int[product.length];
for (int i = 0; i < product.length; i++) {
    int sum = 0;
    for (int j = 0; j < sales[i].length; j++) sum += sales[i][j];
    System.out.println("Sales total for product " + product[i] + " was " + sum);
    sums[i] = sum;
}

在上文中：

• 我们按照规范要求为和创建一个1d数组
• 我们将产品循环
• 对于每个产品，我们循环日期
• 每一天，我们将值添加到sum
• 显示情况
• 将总和存储在1d数组中

for (int i = 0; i < sales[0].length; i++) {
    int sum = 0;
    for (int j = 0; j < product.length; j++) {
        sum += sales[i][j];
    }
    double avg = sum / product.length;
    System.out.println("Average for day " + i + " was " + avg);
}

在上面

• 我们计算每天的总和
• 用乘积数除以得到平均值
• 显示结果

int totalW = 0;
int avgW = 0;
for (int i = 0; i < product.length; i++) {
    for (int j = 6; j <= 7; j++) {
        totalW += sales[i][j];
    }
}
avgW = totalW / 2; //Assuming that we need to get the daily average for the weekend including all 3 products
System.out.println("Weekend sales were " + totalW + " and weekend averages were " + avgW);