C#, Lesson 4 of "Xiaobai Learning Program": Mathematical Calculation

1 text format

/// <summary>
/// Lesson 4 of "Xiaobai Learning Program": Mathematical Calculation
/// This lesson is super simple, it is to calculate the average score (average score)
/// This is what teachers often do one thing.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button4_Click(object sender, EventArgs e)
{     // #1     // First use the previously used array     double[] score = {         540, 340, 650, 120, 554,         643, 612, 234, 345     };     int n = 9;

    // #2 Calculation method of average value
    //average value = sum/total
    double sum = 0.0;
    for (int i = 0; i < n; i = i + 1)
    {         sum += score[i];     }     double avg = sum / n;

    // #3 output information
    StringBuilder sb = new StringBuilder();
    sb.AppendLine("sum value = " + sum + "<br>");
    // with the specified number of digits after the decimal point
    sb.AppendLine("average value = " + String.Format("{0:F4}", avg) + "<br>");
    webBrowser1.DocumentText = sb.ToString();
}

2 code format
 

/// <summary>
/// 《小白学程序》第四课：数学计算
/// 这节课超级简单，就是计算成绩的平均值（平均分）
/// 这个是老师们经常做的一件事。
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button4_Click(object sender, EventArgs e)
{
    // #1
    // 先使用前面用过的数组
    double[] score = {
        540, 340, 650, 120, 554,
        643, 612, 234, 345
    };
    int n = 9;

    // #2 平均值的计算方法
    // 平均值  = 总和 / 总数
    double sum = 0.0;
    for (int i = 0; i < n; i = i + 1)
    {
        sum += score[i];
    }
    double avg = sum / n;

    // #3 输出信息
    StringBuilder sb = new StringBuilder();
    sb.AppendLine("和值 = " + sum + "<br>");
    // 带小数点后面指定的位数
    sb.AppendLine("平均值 = " + String.Format("{0:F4}", avg) + "<br>");
    webBrowser1.DocumentText = sb.ToString();
}

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