计算器实验

来源：互联网发布：c语言整数奇偶排序编辑：程序博客网时间：2024/05/01 09:34

一．实验要求

1）参照Windows提供的计算器工具，设计一个与之类似的程序；另外可参考运行效果下载；

2）基本要求：实现“普通运算”功能，支持连续运算，如连续输入“2+3×5”后点击“等号”按钮进行运算其结果为25.

3）附加要求：

A,支持“科学运算”功能，即输入表达式时遵循运算符号的优先原则，连续输入“2+3×5”后点击“等号”按钮进行运算其结果为17；

B,支持数字键盘（小键盘）输入功能(焦点不在文本框内时也支持键盘输入)；

二．设计思路

1）先设计界面，然后定义每一个按钮对应的事件，相同的事件可重用，重用的方法是在Clik中添加重用的事件；

2）焦点不在文本框内时支持键盘输入：先在界面的属性框内将KeyPreview属性设置成True，然后除了该文本框外的其他控件的TabStop属性设置成False，将文本框的TableIndex设置成0。

核心代码

namespace Calculate

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private voidqingchu()

{

textBox1.Text = null;

textBox2.Text = null;

}

private double s_d(string b)

{

string a = b;

int i =a.IndexOf('.');

int k = 0;

double l = 0;

double result = 0;

if (i < 0)

for (; k < a.Length; k++) { result=result * 10 + a[k] -'0'; }

else

{

for(k = 0; k < i; k++) { result = result * 10 + a[k] -'0';}

for (k = k + 1, l = 1; k < a.Length;k++, l = l * 10) { result = result * 10 + a[k] -'0';}

result = result / l;

}

return result;

}

private double deal(double num1, doublenum2,char a)

{

double result=0;

switch (a)

{

case '+':result=num1 + num2; break;

case '-':result = num1 - num2; break;

case'*': result = num1 * num2;break;

case '/':result = num1 / num2; break;

default: break;

}

return result;

}

private voidbutton10_Click(object sender, EventArgs e)//0 1 2 3 45 6 7 8 9

{

Button a=(Button)sender;

//textBox2.Text += " f ";

textBox1.Text += ((Button)sender).Tag.ToString();

//textBox1.Focus();

}

private void button22_Click(object sender, EventArgse)//←?

{

string a = textBox1.Text;

if (a.Length > 0) textBox1.Text =a.Remove(a.Length - 1);

//textBox1.Focus();

}

private voidbutton23_Click(object sender, EventArgs e)//C

{

qingchu();

textBox1.Focus();

}

private voidbutton14_Click(object sender, EventArgs e)//+ - * /

{

//textBox2.Text += " a ";

string a = textBox1.Text;

int b =a.Length;

if (b > 0 && a[b - 1] <='9' && a[b - 1] >= '0') textBox1.Text += ((Button)sender).Tag.ToString();

//textBox1.Focus();

}

private voidForm1_KeyPress(object sender, KeyPressEventArgs e)

{

e.Handled = true;

switch (e.KeyChar)

{

case (char)(Keys.Enter): button13_Click(button13,null); break;

case '=':button13_Click(button13,null); break;

case (char)Keys.Back: button22_Click(button22,null); break;

case '+':button14_Click(button15, null); break;

case '-':button14_Click(button14, null); break;

case '/': button14_Click(button18, null); break;

case '*':button14_Click(button19, null); break;

case '.':button12_Click(button12, null); break;

case '0': button10_Click(button10, null); break;

case '1':{ button10_Click(button1, null); } break;

case '2': button10_Click(button2, null); break;

case '3':button10_Click(button3, null); break;

case '4':button10_Click(button4, null); break;

case '5':button10_Click(button5, null); break;

case '6': button10_Click(button6, null); break;

case '7':button10_Click(button7, null); break;

case '8':button10_Click(button8, null); break;

case '9':button10_Click(button9, null); break;

default:break;

}

private voidbutton13_Click(object sender, EventArgs e)//=

{

string a = textBox1.Text;

if (a[a.Length - 1] >='0' && a[a.Length - 1] <= '9')

{

textBox2.Text = a;

//textBox1.Text = null;

string fuhao = "";

double[] num = newdouble[100];

string[] split = a.Split(newChar[] { '+','-', '*', '/' });

for (inti = 0; i < a.Length; i++)

{

if(a[i] == '-' || a[i] == '/' || a[i] == '*'|| a[i] == '+') fuhao += a[i];

}

for (inti = 0; i < split.Length; i++)

{

num[i] = s_d(split[i]);

}

if (radioButton1.Checked)//普通运算

{

intp = 0;

doubleresult = num[0];

for(int i = 1; i < split.Length; i++)

{

if (fuhao[i] =='/' &&num[i] == 0) { p = 1; break; }

else result = deal(result, num[i], fuhao[i]);

}

if(p == 1) textBox1.Text ="除数不能为0!";

elsetextBox1.Text = result.ToString();

}

else//科?学¡ì运?算?

{

char[]b = { '*', '/'};

doubleresult = 0;

intp=0;

intindex = fuhao.IndexOfAny(b);

for(;index>=0;index= fuhao.IndexOfAny(b))//找到/*号先计算

{

if (num[index] == 0 && fuhao[index] =='/') { p = 1; break;}

else

{

result =deal(num[index - 1], num[index], fuhao[index]);

num[index-1]=result;

for (int i = index; i< fuhao.Length - 1; i++) num[i] = num[i + 1];//数字往前挪

string f=" ";

for (int i = 1; i< index; i++) f += fuhao[i];

for (int i = index; i< fuhao.Length - 1; i++) f += fuhao[i + 1];

fuhao = f;

}

if(fuhao.Length > 1&&p==0)

{

//textBox2.Text = result.ToString();

p = 0;

result = num[0];

for(int i = 1; i < fuhao.Length; i++)

{

result = deal(result,num[i], fuhao[i]);

}

if(p == 1) textBox1.Text ="除数不能为0!";

else textBox1.Text = result.ToString();

}

//textBox1.Focus();

}

private voidpanel1_Paint(object sender, PaintEventArgs e)

{

}

private void radioButton1_CheckedChanged(object sender,EventArgse)

{

textBox1.Focus();

textBox1.Text = null;

textBox2.Text = null;

}

private voidbutton12_Click(object sender, EventArgs e)//.

{

//textBox2.Text+= " a ";

string a = textBox1.Text;

int b = a.Length;

int i = a.IndexOf('.');

if (i < 0 && b > 0&& a[b - 1] <='9' && a[b- 1] >= '0') textBox1.Text += ".";

textBox1.Focus();

}

三．程序运行效果图

A．普通运算

1+2*3=9

B.科学运算

1+2*3=7

4实验总结

在写这个实验时，我第一个解决的问题是如何解决焦点不在文本框内时支持键盘输入，主要是处理好其他控件的焦点问题。第二个解决的问题是组合键的输入，首先我用的是keyup事件，但是发现自己解决不了问题，接下来用的是keypress事件，只需识别好每个键的值就可以了。

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