HDU1237

 /**************************************************************
   作者：陈新
   邮箱：cx2pirate@gmail.com
   用途：hdu1237
   时间：2014.3.4 23:17
   编译环境 : g++
   数据：10308543    2014-03-15 20:45:36    Accepted    1237    140MS    424K    1948 B    G++    超级旅行者
  *************************************************************/

 #include <iostream>
 #include <stack>
 #include <iomanip>

 using namespace std;

 typedef struct{
     stack<double> nums;
     char op;
 }EXPRESSION;

 bool endingCheck();
 double caculate(double firstNum,double secondNum,char op);
 void caculateExpression(EXPRESSION * pExpr);

 int main(){
     EXPRESSION expr;
     double firstNum = ;
     while(cin >> firstNum){
         if(endingCheck())
         {
             if(firstNum != ){
                 cout << fixed << setprecision() << firstNum << endl;
                 continue;
             }
             else{
                 break;
             }
         }
         else{
             expr.nums.push(firstNum);
         }

         char op;
         while(op = cin.get()){
             double thirdNum;
             cin >>  thirdNum;
             if(op == '+' || op == '-'){
                 caculateExpression(&expr);
                 expr.nums.push(thirdNum);
                 expr.op = op;
             }
             else{
                 double secondNum = expr.nums.top();
                 expr.nums.pop();
                 expr.nums.push(caculate(secondNum,thirdNum,op));
             }
             if(endingCheck()){
                 caculateExpression(&expr);
                 break;
             }
         }

         cout << fixed << setprecision() << expr.nums.top() << endl;
         expr.nums.pop();
     }
     return ;
 }

 bool endingCheck(){
     return cin.get() == '\n';
 }

 double caculate(double firstNum,double secondNum,char op){
     if(op == '+'){
         return firstNum + secondNum;
     }
     else if(op == '-'){
         return firstNum - secondNum;
     }
     else if(op == '*'){
         return firstNum * secondNum;
     }
     else if(op == '/'){
         return firstNum / secondNum;
     }
 }

 void caculateExpression(EXPRESSION * pExpr){
     if(pExpr ->nums.size() == ){
         return;
     }
     else{
         double secondNum = pExpr ->nums.top();
         pExpr ->nums.pop();
         double firstNum = pExpr ->nums.top();
         pExpr ->nums.pop();
         pExpr ->nums.push(caculate(firstNum,secondNum,pExpr ->op));
     }
 }