c++读入导出csv文件数据

#include 
#include 
#include 
#include 
#include 
using namespace std;

提示：如果是excel文件，可以用wps或者office先转换成csv,如果手动改后缀名可能有问题

    vector x1, x2, x3, x4;//文件一共四列
    ifstream inFile("/home/lessle6/Project/AAATEST/build/2.csv", ios::in);
    if (!inFile) {
        cout << "打开文件失败！" << endl;
        exit(1);
    }
    int i = 0;
    string line;
    string field;
    while (getline(inFile, line)) // getline(inFile, line)表示按行读取CSV文件中的数据
    {
        string field;
        istringstream sin(line); //将整行字符串line读入到字符串流sin中

        getline(sin, field, ','); //将字符串流sin中的字符读入到field字符串中，以逗号为分隔符
        x1.push_back(atoi(field.c_str())); //将刚刚读取的字符串转换成int

        getline(sin, field, ','); //将字符串流sin中的字符读入到field字符串中，以逗号为分隔符
        x2.push_back(atoi(field.c_str())); //将刚刚读取的字符串转换成int

        getline(sin, field, ','); //将字符串流sin中的字符读入到field字符串中，以逗号为分隔符
        x3.push_back(atoi(field.c_str())); //将刚刚读取的字符串转换成int

        getline(sin, field); //将字符串流sin中的字符读入到field字符串中，以逗号为分隔符
        x4.push_back(atoi(field.c_str())); //将刚刚读取的字符串转换成int
        i++;
    }
    inFile.close();

   vector y1 = fun(x1);//vector fun(vector x_)
    vector y2 = fun(x2);
    vector y3 = fun(x3);
    vector y4 = fun(x4);
    cout << "y1.size" << y1.size() << endl;
    cout << "y2.size" << y2.size() << endl;
    cout << "y3.size" << y3.size() << endl;
    cout << "y4.size" << y4.size() << endl;
    ofstream outFile("/home/lessle6/Project/AAATEST/res.csv", ios::out);
    // ios::out：如果没有文件，那么生成空文件；如果有文件，清空文件
    if (!outFile) {
        cout << "打开文件失败！" << endl;
        exit(1);
    }
    //写入4列数据
    for (int j = 0; j < y1.size(); j++) {
        outFile << y1.at(j) << ",";
        outFile << y2.at(j) << ",";
        outFile << y3.at(j) << ",";
        outFile << y4.at(j) << ",";
        outFile << endl;
    }
    outFile.close();
    cout << "写入数据完成" << endl;