清空后如何在texbox中添加第二个数字？计算器

问题描述

Button[] numbers = new Button[10];
Button[] operators = new Button[5];
Button[] soperators = new Button[15];
string[] symbols = new string[]{ "+", "-", "*", "/" ,"="};
string[] scientific = new string[] {"sin","cos","tan","log","e","x2","^","!","(",")","[","]","Ans","rad","exp" };
public Form1()
{
    InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
    for (int i = 0; i < 10; i++)
    {
        if (i < 9)
        {
            numbers[i] = new Button();
            numbers[i].Text = (i + 1).ToString();
            numbers[i].Size = new Size(40, 40);
        }
        else
        {
            numbers[9] = new Button();
            numbers[9].Text = "0";
            numbers[9].Size = new Size(130, 40);
        }
        numbers[i].Click += btn_Click;
        this.flowLayoutPanel2.Controls.Add(numbers[i]);
    }
    for (int i = 0; i < 5; i++)
    {
        operators[i] = new Button();
        operators[i].Text = symbols[i];
        operators[i].Click += op_Click;
        this.flowLayoutPanel3.Controls.Add(operators[i]);
    }

    for (int i = 0; i < 15; i++)
    {
        soperators[i] = new Button();
        soperators[i].Text = scientific[i];
        soperators[i].Size = new Size(50, 30);
        this.flowLayoutPanel1.Controls.Add(soperators[i]);
    }
}
public void btn_Click(object sender,EventArgs e)
{
    Button b = (Button)sender;
    textBox1.Text = textBox1.Text + b.Text;
}
int firstNo;int secondNo=0;
string si;
public void op_Click(object sender,EventArgs e)
{
    Int32 result;
    Button b = (Button)sender;
    si = b.Text;
    firstNo = int.Parse(textBox1.Text);
    result = firstNo;
    textBox1.Text = "";
    secondNo = int.Parse(textBox1.Text);
    if (textBox1.Text!= "")
    {
        switch(si)
        {
            case "+":
                result = firstNo + secondNo;
                break;
            case "-":
                result = firstNo - secondNo;
                break;
            case "*":
                result = firstNo * secondNo;
                break;
            case "/":
                result = firstNo / secondNo;
                break;
            case "=":
                textBox1.Text = result.ToString();
                break;
        }

    }
}

推荐答案

private double firstValue;

private string operatorToExecute;

private void ActionOperator_Click((object sender, EventArgs e))
{
    operatorToExecute = // get the operator from the button's Text property

    firstValue = // parse the entry TextBox to get the first value

    // clear the entry TextBox
}

private void EqualOperator_Click()
{
    // do you need to check and see if you have a valid action operator ?
    // do you need to check and see if you have a valid first value ?
    // do you need to handle more than one click at a time of this button ?
    
    double secondValue = // get the second value from the entry TextBox
    
    // switch statement goes here to execute action operator
    
    // display result or error message
}

这篇关于清空后如何在texbox中添加第二个数字？计算器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！