java - 从文件中查找输入的平均值

Question

大家好，我的程序好像有问题

示例输入如下:

3 1 2 3 

0 1 12

-12

14 1 2 3 

5 1 2 3 4 5 6 

4 10 20 30 40

示例输出必须是:第 1 行的平均值为 2.0

*** Error (line 2): Line is empty - average can't be taken

*** Error (line 3): Header value of 0 - average can't be taken

The average of the values on line 4 is 12.0

*** Error (line 5): Corrupt line - negative header value

*** Error (line 6): Corrupt line - fewer values than header

*** Error (line 7): Corrupt line - extra values on line

The average of the values on line 8 is 25.0

There were 3 valid lines of data
There were 5 corrupt lines of data

这是我目前所拥有的:

public class DataChecker
    public static void main(String[] args) throws IOException {
        File myFile = new File("numbers.text");
        Scanner scanner = new Scanner(myFile); 
        int count=0,count2=0,sum=0;
        int[] val = new int[50];
        String line = null;
        while (scanner.hasNextLine()) {              
            line = scanner.nextLine();
            Scanner lineScanner = new Scanner(line); 
            count++;
            while(lineScanner.hasNextInt()){
                lineScanner.nextInt();          
                count2++;
                
            }
            
            if(lineScanner.hasNextInt())    
                val[count2] = lineScanner.nextInt();    
            
            for(int i =0;i<count2;i++) {
                sum += val[i];
                sum = (sum/count2);
                System.out.println(sum);
            }
            
            System.out.println("There are " + count2 + " numbers on line " + count);
            lineScanner.close();
            count2=0;
            
        }
        
        scanner.close();
    } 

感谢任何帮助。

Answer 1

您没有正确计算每一行的数字。该算法应该是读取一行，使用扫描仪将其标记化，然后消耗整数直到没有更多。跟踪总和和看到的整数数量，然后取这两个总和的商以获得平均值。

// your initialization code
int numLines = 0;

while (scanner.hasNextLine()) {              
    line = scanner.nextLine();
    Scanner lineScanner = new Scanner(line); 
    numLines++;
    int count = 0;
    int total = 0;

    while (lineScanner.hasNextInt()) {
        total += lineScanner.nextInt();
        ++count;
    }

    if (count == 0) {
        System.out.println("Line " + numLines + " has no numbers.");
        continue;
    }

    double avg = 1.0d * total / count;
    System.out.println("The average of the values on line " + numLines + " is " + avg);
    lineScanner.close();
}