Question

我正在尝试编写一个c＃代码，该代码可以获得带有锯齿状数组的学生成绩（每个学生的成绩数可能不同），并计算每个学生的平均成绩。这是我的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace students_avg
{
    class Program
    {
        static void Main(string[] args)
        { 
            int n,m,i,j,count=0,avg;
            Console.WriteLine("please enter the number of students");
            n = Convert.ToInt32(Console.ReadLine());
            int [][] student = new int [n+1][];
            for (i = 1; i <= n; i++)
            {
                Console.WriteLine("how many grades does student number " + i + "have?");
                m = Convert.ToInt32(Console.ReadLine());
                student[i] = new int[m];
                Console.WriteLine("please enter student number " + i + "'s grades");
                for (j = 1; j <= m; j++)
                {
                    student[i] =new int[] {Convert.ToInt32(Console.ReadLine())};
                    count +=Convert.ToInt32(student[i]);              
                }
                avg = count / m ;
                Console.WriteLine("the student number " + i + "'s average is " + avg);          
            }
            Console.ReadKey();
        }
    }
}

但我有问题，因为它没有给我正确的平均值。那么如何以正确的方式添加学生的成绩呢？

Answer 1

更改此行：

int n,m,i,j,count=0,avg;

为：

int n,m,i,j,count=0;
double avg;

和这一行：

avg = count / m ;

到

avg = (double)count / (double)m ;
count=0;

Answer 2

另外：您为此处的每个成绩输入创建了新的成绩数组

student[i] =new int[] {Convert.ToInt32(Console.ReadLine())};

该行应为

student[i][j-1] =Convert.ToInt32(Console.ReadLine());

第二

count +=Convert.ToInt32(student[i]);

应该是

count += student[i][j-1];

Answer 3

我想使用锯齿状数组是你的任务的必要条件，所以我会坚持使用OP。如果不是，您可以使用List<List<int>>作为马克建议的等级。

我尝试对代码进行微小的更改。

问题是，您缺少声明阵列中的“锯齿状”部分，并且在尝试添加总数时，您遇到了一些问题。

static void Main(string[] args)
{
    int n, m, i, j, count;

    Console.WriteLine("please enter the number of students");
    n = Convert.ToInt32(Console.ReadLine());
    int[][] student = new int[n][];
    for (i = 0; i < n; i++)
    {
        count = 0;
        Console.WriteLine("how many grades does student number " + (i+1) + "      have?");
        m = Convert.ToInt32(Console.ReadLine());
        student[i] = new int[m];
        Console.WriteLine("please enter student number " + (i+1) + "'s grades");
        for (j = 0; j < m; j++)
        {
            student[i][j] = Convert.ToInt32(Console.ReadLine());
            count += Convert.ToInt32(student[i][j]);
        }
        var avg = count / m;
        Console.WriteLine("the student number " + i + "'s average is " + avg);

    }


    Console.ReadKey();
}

Answer 4

立即修改代码

static void Main(string[] args)
    {
        int n, m, i, j, count = 0, avg;
        Console.WriteLine("please enter the number of students");
        n = Convert.ToInt32(Console.ReadLine());
        int[][] student = new int[n + 1][];
        for (i = 1; i <= n; i++)
        {
            Console.WriteLine("how many grades does student number " + i + "      have?");
            m = Convert.ToInt32(Console.ReadLine());
            student[i] = new int[m+1];
            Console.WriteLine("please enter student number " + i + "'s grades");
            for (j = 1; j <= m; j++)
            {
                student[i][j] = Convert.ToInt32(Console.ReadLine());
                count += Convert.ToInt32(student[i][j]);
            }
            avg = count / m;
            Console.WriteLine("the student number " + i + "'s average is " + avg);
            avg = 0;
        }


        Console.ReadKey();
    }

如何将数组添加到整数c＃

4 个答案: