第一次写程序 编译错误。。。 求教 无从下手啊

Question

 for (int i = 0; i < values1.Length; i++) ;
                {
                    int a = 0;
                    int b = values1[a];
                    if (b < 60)
                    {
                        b = 59;
                    }
                    else
                    {
                        Double[] scor;
                        switch (b)
                        {
                            case 59:
                                scor[a] = 0.00; break;
                            case 60:
                                scor[a] = 1.00; break;
                            case 61:
                            case 62:
                            case 63:出现这个错误是什么意思啊

Answer 1

你就是忘记给变量赋值，例如：
Double[] scor = new Double[1];

Answer 2

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace jidianbate1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        Double gpa;
        Double sum1 = 0.00;
        Double sum2 = 0.00;        private void buttontj1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "")
            {
                MessageBox.Show("请输入要添加的数据");
            }
            else
            {
                listBox1.Items.Add(textBox1.Text);
                textBox1.Text = "";
            }        }        private void buttonsc1_Click(object sender, EventArgs e)
        {
            if (listBox1.SelectedItems.Count == 0)
            {
                MessageBox.Show("请选择要删除的项目");
            }
            else
            {
                listBox1.Items.Remove(listBox1.SelectedItem);
            }
        }        private void buttontj11_Click(object sender, EventArgs e)
        {
            if (textBox2.Text == "")
            {
                MessageBox.Show("请输入要添加的数据");
            }
            else
            {
                listBox2.Items.Add(textBox2.Text);
                textBox2.Text = "";
            }
        }        private void buttonsc11_Click(object sender, EventArgs e)
        {
            if(listBox2.SelectedItems.Count == 0)
            {
                MessageBox.Show("请选择要删除的项目");
            }
            else
            {
                listBox2.Items.Remove(listBox2.SelectedItem);
            }
        }        private void button1_Click(object sender, EventArgs e)
        {
            int[] values1 = new int[this.listBox1.Items.Count];
            for (int i = 0; i < this.listBox1.Items.Count - 1; i++)
            {
                int values = Convert.ToInt32(this.listBox1.Items[i].ToString().Trim());
                values1[i] = values;
            }
            int[] values11 = new int[this.listBox2.Items.Count];
            for (int i = 0; i < this.listBox2.Items.Count - 1; i++)
            {
                int values = Convert.ToInt32(this.listBox2.Items[i].ToString().Trim());
                values11[i] = values;
            }
            if (values1.Length != values11.Length)
            {
                MessageBox.Show("输入的成绩与学分个数不相符，请核对");
            }
            else
            {
                for (int i = 0; i < values1.Length; i++) ;
                {
                    int a = 0;
                    int b = values1[a];
                    if (b < 60)
                    {
                        b = 59;
                    }
                    else
                    {
                        Double[] scor;                        switch (b)
                        {
                            case 59:
                                scor[a] = 0.00; break;
                            case 60:
                                scor[a] = 1.00; break;
                            case 61:
                            case 62:
                            case 63:
                                scor[a] = 1.33; break;
                            case 64:
                            case 65:
                            case 66:
                                scor[a] = 1.67; break;
                            case 67:
                            case 68:
                            case 69:
                                scor[a] = 2.00; break;
                            case 70:
                            case 71:
                            case 72:
                            case 73:
                                scor[a] = 2.33; break;
                            case 74:
                            case 75:
                            case 76:
                                scor[a] = 2.67; break;
                            case 77:
                            case 78:
                            case 79:
                                scor[a] = 3.00; break;
                            case 80:
                            case 81:
                            case 82:
                            case 83:
                                scor[a] = 3.33; break;
                            case 84:
                            case 85:
                            case 86:
                                scor[a] = 3.67; break;
                            case 87:
                            case 88:
                            case 89:
                                scor[a] = 4.00; break;
                            case 90:
                            case 91:
                            case 92:
                            case 93:
                            case 94:
                                scor[a] = 4.33; break;
                            case 95:
                            case 96:
                            case 97:
                            case 98:
                            case 99:
                            case 100:
                                scor[a] = 4.67; break;
                        }
                        sum1 += scor[a] * values11[a];
                        sum2 += values11[a];
                    }
                    a++;
                }
                gpa = sum1 / sum2;
                label1.Text = gpa.ToString();
            }        }
    }
}
额。。  全发过来了

Answer 3

double[] scor = new double[大小];

Answer 4

double[] scor = new double[SIZE]; //SIZE 常量
//如果SIZE不能确定，则可以考虑用List，ArrayList之类的动态创建

Answer 5

List<double> scor = new List<double>(); // 这样就行
//不过我看了一下你的逻辑，定义一个Double够用了吧？
double scor = 0.0；

Answer 6

List<double> scor = new List<double>(); 你想用数组的话用这个就可以。

Answer 7

            else
            {
                for (int i = 0; i < values1.Length; i++) ;
                {
                    int a = 0;
                    int b = values1[a];
                    if (b < 60)
                    {
                        b = 59;
                    }
                    else
                    {
                        List<double> scor = new List<double>();                        switch (b)
                        {
                            case 59:
                                scor.Add(0.00); break;
                            case 60:
                                scor.Add(1.00); break;
                            case 61:
                            case 62:
                            case 63:
                                scor.Add(1.33); break;
                            case 64:
                            case 65:
                            case 66:
                                scor.Add(1.67); break;
                            case 67:
                            case 68:
                            case 69:
                                scor.Add(2.00); break;
                            case 70:
                            case 71:
                            case 72:
                            case 73:
                                scor.Add(2.33); break;
                            case 74:
                            case 75:
                            case 76:
                                scor.Add(2.67); break;
                            case 77:
                            case 78:
                            case 79:
                                scor.Add(3.00); break;
                            case 80:
                            case 81:
                            case 82:
                            case 83:
                                scor.Add(3.33); break;
                            case 84:
                            case 85:
                            case 86:
                                scor.Add(3.67); break;
                            case 87:
                            case 88:
                            case 89:
                                scor.Add(4.00); break;
                            case 90:
                            case 91:
                            case 92:
                            case 93:
                            case 94:
                                scor.Add(4.33); break;
                            case 95:
                            case 96:
                            case 97:
                            case 98:
                            case 99:
                            case 100:
                                scor.Add(4.67); break;
                        }
                        sum1 += scor[a] * values11[a];
                        sum2 += values11[a];
                    }
                    a++;
                }
                gpa = sum1 / sum2;
                label1.Text = gpa.ToString();
            }

Answer 8

变量名，不要重名。
 List<double> scorList = new List<double>();
            double scor = 0.00;

Answer 9

两个需要一个List就够了。

Answer 10

额。。 再追问一个问题
在整个程序进行运算完之后  怎样对之前的数组清空。。
就是在        gpa = sum1 / sum2;
              label1.Text = gpa.ToString();
之后 
要不程序运算完之后  要想进行下次运算  用户只能关闭程序再打开  否则之前的数据会干扰结果  
刚刚试过了

Answer 11

List有Clear()的方法，数组的全部置0就行了。

Answer 12

第一次写程序不写hello world肯定是会出错的啊！

Answer 13

刚开始学是这样子的，慢慢来，有问题可以咨询：software