类似于词法分析器

C# code

        private void button1_Click(object sender, EventArgs e)        {            List<string> olist = new List<string>(new string[] { ">=","<=","++","+=","-=","=="});//组合符号            List<char> list = new List<char>(new char[] {' ',',',';','{','}','(',')','+','-','=','>','<' });//单符号            string txt = System.Text.RegularExpressions.Regex.Replace(textBox1.Text.Trim(), @"\s", " ");            string temp = "";            for (int i=0;i<txt.Length;i++)            {                if (i < txt.Length - 1)                {                    if (olist.Contains(txt[i].ToString() + txt[i + 1].ToString()))                    {                        if (temp.Length > 0)                        {                            listBox1.Items.Add(temp);                            temp = "";                        }                        listBox1.Items.Add(txt[i].ToString() + txt[i + 1].ToString());                        i++;                        continue;                    }                }                if(list.Contains(txt[i]))                {                    if (temp.Length > 0)                    {                        listBox1.Items.Add(temp);                        temp = "";                    }                    if (txt[i] != ' ')                        listBox1.Items.Add(txt[i].ToString());                    continue;                                    }                temp += txt[i].ToString();            }        }

处理代码
测试代码：

C/C++ code

int a,b;
main()
{
  if(a>b)
    a+b=10;
  else if(a==b)
    a-=b;
  else
    a=b;
}

结果：

int
a
,
b
;main
(
){if
(
a
>
b
)a
+
b
=
10
;else
if
(
a
==
b
)a
-=
b
;elsea
=
b
;}

：正确