public void symbols(int i)
{
int j = 0;
switch (ac[i])
{
case '!': double num = opnum.Pop();num = Functions.factorial(num);opnum.Push(num);break;//factorial为阶乘运算。
case '(': opt op0 = new opt(ac[i], 4); optr.Push(op0); break;
case ')': opt op1 = new opt('(', 4); opt op2 = optr.Pop();
while (op2.Equals(op1) != true)
{
op2 = optr.Pop();
}
break;//计算括号间所有运算
case '+': j = 1; operation(i,j); break;//opreation需要重新定义
case '*': j = 2; operation(i,j); break;
case '/': j = 2; operation(i,j); break;
case '^': j = 3; operation(i,j); break;
case '-': if (flag) { j = 1; operation(i,j); } else { double tempnum = opnum.Pop(); tempnum *= -1; opnum.Push(tempnum); }; break;
default: break;//需重写
}
//TODO push into the stack
}
public void operation(int i,int j)
{
opt temp = optr.Peek();
opt inst = new opt(ac[i], j);
double c = 0;
if (temp.j > j)
{
//四则计算
double a = opnum.Pop();
double b = opnum.Pop();
char psmd = temp.opera;
switch (psmd)
{
case '+': c = b + a; opnum.Push(c); break;
case '-': c = b - a; opnum.Push(c); break;
case '*': c = b * a; opnum.Push(c); break;
case '/': if (a != 0) { c = b / a; opnum.Push(c); } break;//需要加入差错处理！！！！！
case '^': c = Math.Pow (b,a); opnum.Push(c); break;
default: break;//需要加入差错处理！！！！！
}
}
optr.Push(inst);
}
