private bool Get2Operands(out Rational left, out Rational right)
{
left = right = new Rational();
if (data.IsEmpty())
{
return(false);
}
right = data.Pop();
if (data.IsEmpty())
{
return(false);
}
left = data.Pop();
return(true);
}
///////////////////////////////////////////////////////////
public Rational Run(string pc, out string strout)
{
int de = 0; //输入字符的优先级
char c; //输入的字符
int i = 0, n = pc.Length;
// pc//存放输入的全部字符
char op;
c = pc[i++];
Rational ling = new Rational();
strout = "";
while (c != 0)
{
string strt, strd;
while (c == ' ')
{
c = pc[i++];
}
strt = "+-*/^()[]{}0123456789.";
if (strt.IndexOf(c) >= 0)
{
strt = "+-*/^()[]{}";
if (strt.IndexOf(c) >= 0)
{
switch (c)
{
case '{':
{
de = 1; break;
}
case '}':
{
de = 1; break;
}
case '[':
{
de = 2; break;
}
case ']':
{
de = 2; break;
}
case '(':
{
de = 3; break;
}
case ')':
{
de = 3; break;
}
case '+':
{
de = 4; break;
};
case '-':
{
de = 4; break;
};
case '*':
{
de = 5; break;
};
case '/':
{
de = 5; break;
};
case '^':
{
de = 6; break;
}
}
while (!degree.IsEmpty() && de <= degree.Gettop() && de > 3 && de < 6)
{
switch (op = oper.Gettop())
{
case '+':
case '-':
case '*':
case '/':
case '^':
DoOperator(op); break;
}
oper.Pop(); degree.Pop();
strout = strout + oper.GetStackALLDate("oper");
strout = strout + data.GetStackALLDate("data");
if ((op == '(') || (op == '[') || (op == '{'))
{
break;
}
}
if ((c != ')') && c != ']' && c != '}')
{
oper.Push(c);
strout = strout + oper.GetStackALLDate("oper");
//strout = strout + data.GetStackALLDate("data");
//if ((c == '(')) degree.Push(0);
//else if (c == '[') degree.Push(-1);
//else if (c == '{') degree.Push(-2);
//else degree.Push(de);
//if (c == '(' || c == '[' || c == '{') degree.push(de);
degree.Push(de);
}
else
{
if (de == 3)
{
bool flag = false;
while (!degree.IsEmpty())
{
int de1 = degree.Gettop();
if (de1 <= 2)
{
strout = "error"; return(ling);
}
switch (op = oper.Gettop())
{
case '(': { flag = true; break; }
case '+':
case '-':
case '*':
case '/':
case '^':
DoOperator(op); break;
}
oper.Pop(); degree.Pop();
strout = strout + oper.GetStackALLDate("oper");
strout = strout + data.GetStackALLDate("data");
if (flag == true)
{
break;
}
//if ((op == '(') || (op == '[') || (op == '{')) break;
}
if (flag == false)
{
strout = "error"; return(ling);
}
//degree.Pop(); oper.Pop();
}
else if (de == 2)
{
bool flag = false;
while (!degree.IsEmpty())
{
int de1 = degree.Gettop();
if (de1 <= 1)
{
strout = "error"; return(ling);
}
switch (op = oper.Gettop())
{
case '[': { flag = true; break; }
case '+':
case '-':
case '*':
case '/':
case '^':
DoOperator(op); break;
}
oper.Pop(); degree.Pop();
strout = strout + oper.GetStackALLDate("oper");
strout = strout + data.GetStackALLDate("data");
if (flag == true)
{
break;
}
//if ((op == '(') || (op == '[') || (op == '{')) break;
}
//degree.Pop(); oper.Pop();
if (flag == false)
{
strout = "error"; return(ling);
}
}
else
{
bool flag = false;
while (!degree.IsEmpty())
{
int de1 = degree.Gettop();
if (de1 <= 0)
{
strout = "error"; return(ling);
}
switch (op = oper.Gettop())
{
case '{': { flag = true; break; }
case '+':
case '-':
case '*':
case '/':
case '^':
DoOperator(op); break;
}
oper.Pop(); degree.Pop();
strout = strout + oper.GetStackALLDate("oper");
strout = strout + data.GetStackALLDate("data");
if (flag == true)
{
break;
}
//if ((op == '(') || (op == '[') || (op == '{')) break;
}
//degree.Pop(); oper.Pop();
if (flag == false)
{
strout = "error"; return(ling);
}
}
}
if (i < n)
{
c = pc[i++];
}
else
{
c = (char)0;
}
}
else
{
strd = "";
if (c != 0)
{
strd = strd + c;
}
if (i < n)
{
c = pc[i++];
}
else
{
c = (char)0;
}
strt = "0123456789.";
while ((c != 0) && (strt.IndexOf(c) >= 0))
{
if (c != 0)
{
strd = strd + c;
}
if (i < n)
{
c = pc[i++];
}
else
{
c = (char)0;
}
}
data.Push(new Rational(Convert.ToDouble(strd)));
strout += data.GetStackALLDate("data");
}
}
else
{
return(ling);
}
}
while (!oper.IsEmpty())//处理剩余运算符
{
switch (op = oper.Gettop())
{
case '+':
case '-':
case '*':
case '/':
case '^':
DoOperator(op); break;
}
oper.Pop();
degree.Pop();
strout += oper.GetStackALLDate("oper");
strout += data.GetStackALLDate("data");
}
return(data.Gettop());
}