private void equal_Click(object sender, EventArgs e) //点击等于
{
if (isEqual == true)
{
textBox1.Text = "0";
return;
}
isEqual = true;
str = textBox1.Text;
String str1 = new Calculate().calculating(str);
if (m_ && str1 != null && !str.Equals("错误")) //读入计算后的存储数据
{
memory = new string(str1.ToCharArray());
m_ = false;
}
if (str.Equals("错误"))
{
error.Visible = true;
str = "";
}
else
{
str = str1;
}
textBox1.Text = str;
}