从输入文件的最后一列决定一个例程

Question

我正在尝试为c++编写一个例程，读取如下输入文件，

   1             12       13        0        0      1      0      INLE
   2              1       12        0        0      1      0      INLE
   3             11        2        0        0      1      0      INLE
   4             13       11        0        0      1      0      INLE
   5              2        8        0        0      2      0      OUTL
   6              8        9        0        0      2      0      OUTL
   7              9       10        0        0      2      0      OUTL
   8             10        3        0        0      2      0      OUTL
   9              4        5        0        0      3      0      SYMP
  10              5        6        0        0      3      0      SYMP
  11              6        7        0        0      3      0      SYMP
  12              7        1        0        0      3      0      SYMP
  13             14        4        0        0      4      0      WALL
  14             16       14        0        0      4      0      WALL
  15             15       16        0        0      4      0      WALL
  16              3       15        0        0      4      0      WALL

在本例中，我必须将第二列和第三列的值赋给右边最后一列指定的条件。比如，

read the last column; 
    if it reads the word INLE
     { 
      asign the values of COLUMN2 and COLUMN3 to the pointer &p_InflowNode[i];
     }
if it reads the word OUTL
     { 
      asign the values of COLUMN2 and COLUMN3 to the pointer &p_NonrefNode[i];
     }
etc...

所以我的主要问题是，我如何使c++首先读取最后一列，然后决定如何处理第二列和第三列的值?

Thaks

Answer 1

我建议你这么做

struct CData
{
   int nC1;
   int nC2;
   int nC3;
   int nC4;
   int nC5
   int nC6;
   int nC7;
   string sMode;
   friend ifstream& operator >>(ifstream&, struct& CData);
}

只需要重载输入操作符，然后声明一个结构体的对象并对其进行操作:

struct CData cObj;
ifstream ifIn;
ifIn.open("yourfile.txt");
while(ifIn)
{
   ifIn>>cObj;
   //now you can use the nested if and else structure here
}

Answer 2

我建议如果换行符一致，则在缓冲区中逐行读取文件(std::getLine)，并检查结束字符串。

检查行尾

Answer 3

我最终是这样解决的，

#include <fstream>
#include <string>
#include <sstream>
#include <iostream>
using namespace std;
int main()
{
    ifstream myfile("ramp.bnd");
    string  Point1;
    string  Point2;
    string  Boundary;
    string line,temp;
    if (myfile.is_open())
    {
        while ( getline (myfile,line) )
        {
            istringstream iss(line);
            iss >> temp >> Point1 >> Point2 >> temp >> temp >> temp >> temp >> Boundary;
            if (Boundary == "INLE") {
                cout << "Inlet condition!!"; //To add more code
            }
        cout << " n";
        }
        myfile.close();
    }
    else std::cout << "Unable to open file";    
    myfile.close();
    return 0;
}