Question

我有一个由0到10之间的数字组成的数组。例如，

1, 3, 5, 7, 5, 3, 1, 9

我想计算数组中每个数字从0到10的出现次数。像这样的东西（模拟输出）：

number | occurrence
0        0
1        2
2        0
3        2
4        0
5        2
6        0
7        2
8        0
9        1
10       0

编辑：这是一项高中作业：编写一个程序，反复提示用户在测试中提供分数（满分10分）。程序应继续询问用户标记，直到提供负值。应忽略任何大于10的值。一旦程序读完所有分数，就应该生成一个包含以下标题的表格（并自动填写表格的其余部分）：分数＃出现次数然后程序应计算平均分数，四舍五入到小数点后一位。我的代码回答了这个问题：

public static int[] resize(int[] a) {   
    int[] expandedArray = new int[a.length + 1];
    for (int i = 0; i < a.length; i++) {
        expandedArray[i] = a[i];
    }
    return expandedArray;   
}

public static void main (String[]args) {

    @SuppressWarnings("resource")
    Scanner scan = new Scanner(System.in);

    boolean positive = true;
    int count = 0;
    int[] originArray = new int[0];

    for (@SuppressWarnings("unused")
    int i = 0; positive; i++) {
        System.out.println("Enter a score: ");
        int input = scan.nextInt();
        System.out.println("The input is recorded: " + input);


        if (input < 0) {
            positive = false;
            System.out.println("The input is negative.");

        }else if (input > 10){
            System.out.println("///INVALID///: Must be out of 10!");
        } else {

            System.out.println("count: " + count);

            originArray = resize(originArray);
            System.out.println("originArray resized");

            originArray[count] = input;

            System.out.println("The index = count = " + count +" would be assigned input: " + input);

            for (int j = 0; j <= count; j++) {
                System.out.println(j + ": " + originArray[j]);
            }
            count++;
            System.out.println("count++: " + count);
        }
    }
    System.out.println("Program has stopped taking inputs. Outputting results:");
    System.out.println("   Score   | Occurrences ");
    }

Answer 1

如果给出输入数组，则以下代码将在counts数组中为您生成结果。

int [] counts = new int[11];
for (int i = 0; i < input.length; i++) {
    counts[input[i]]++;
}

Java：计算数组

1 个答案: