停止C ++中的值的自动截断/取整

Question

struct data {

    double x_axis;
    double y_axis;
    double z_axis;
    double relativity;

};


typedef struct data Data;

}

Data Min_Point;
vector<double> distances;
vector<Data> Point_Main_File;

void get_Minimum_Cartesian_Distance(Data Point, vector<Data> * vec){


    if(vec == NULL || vec->size() == 0)
        return;

    Data * tempPoint = &vec->at(0);

    Min_Point.x_axis = tempPoint->x_axis;

    Min_Point. y_axis = tempPoint->y_axis;

    Min_Point.z_axis = tempPoint->z_axis;

    Min_Point.relativity = tempPoint->relativity;

    double min = Cartesian_distance(Point, *tempPoint);

    double temp = 0.0;

    for(int iterate = 1; iterate < vec->size(); iterate++){

        tempPoint = &vec->at(iterate);

        temp = Cartesian_distance(Point, *tempPoint);

        if(min > temp){

            min = temp;


            Min_Point.x_axis = tempPoint->x_axis;

            Min_Point. y_axis = tempPoint->y_axis;

            Min_Point.z_axis = tempPoint->z_axis;

            Min_Point.relativity = tempPoint->relativity;

        }

    }

    cout << "Min: "<<min<<endl;

    Point_Main_File.push_back(Min_Point);
    distances.push_back(min);


}

int main(){

    vector<Data> Points_myfile, Points_original_file;

    vector<string> Strings;

    ifstream fileReader;

    fileReader.open("myfile.ply", ios::in);


    if(fileReader.is_open()){

        string str = "";
        int count = 0;


        while(!fileReader.eof()){

            if(count < 31){

                getline(fileReader, str, '\n');

                Strings.push_back(str);
                cout << str << endl;

                count++;

            }
            else{
                double input = 0;
                Data Point;

                fileReader >> input;

                if(input == 0)
                    break;

                Point.x_axis =  input;
                fileReader >> input;
                Point.y_axis = input;
                fileReader >> input;
                Point.z_axis = input;
                fileReader >> input;
                Point.relativity = input;

                Points_myfile.push_back(Point);

                cout << Point.x_axis << " " << Point.y_axis << " "<< Point.z_axis << " " << Point.relativity << endl;


            }


        }



        fileReader.close();
    }

    else{
        cout<<"File not Found"<<endl;
    }



    fileReader.open("original.ply", ios::in);


    if(fileReader.is_open()){

        string str = "";
        int count = 0;


        while(!fileReader.eof()){


            if(count < 31){

                getline(fileReader, str, '\n');


                cout << str << endl;

                count++;

            }
            else{
                double input = 0;
                Data Point;

                fileReader >> input;

                if(input == 0)
                    break;

                Point.x_axis =  input;
                fileReader >> input;
                Point.y_axis = input;
                fileReader >> input;
                Point.z_axis = input;
                fileReader >> input;
                Point.relativity = input;

                Points_original_file.push_back(Point);

                cout << Point.x_axis << " " << Point.y_axis << " " << Point.z_axis << " " << Point.relativity << endl;


            }


        }



        fileReader.close();
    }

    else{
        cout << "File not Found" << endl;
    }



    for(int iterate = 0; iterate < Points_original_file.size(); iterate++){


        get_Minimum_Cartesian_Distance(Points_original_file.at(iterate), &Points_myfile);


    }

    cout<<endl<<endl;

    ofstream outfile;

    outfile.open("myfile.ply", ios::out);

    if(outfile.is_open()){

        for(int iterate = 0; iterate < Strings.size(); iterate++){

            outfile << Strings.at(iterate) << endl;

        }

        int total_size = distances.size();

        for(int index = 0; index < total_size; index++){

            outfile << std::fixed << Point_Main_File.at(0).x_axis << " ";
            outfile << std::fixed << Point_Main_File.at(0).y_axis << " ";
            outfile << std::fixed << Point_Main_File.at(0).z_axis <<" ";
            outfile << std::fixed << Point_Main_File.at(0).relativity << endl;    

            Point_Main_File.erase(Point_Main_File.begin());

            distances.erase(distances.begin());
        }

        outfile.close();
    }
    else {
        cout << "Cant Open File" << endl;
    }

    return 0;
}

我有一个程序，与第二个文件相比，它根据笛卡尔距离重新排列层文件中的行。但是这些值会自动取整，我不希望这样。例如，如果最初，我的行包含

9.832004 1.55884 1.4956 0.2224

重新排列文件时，将其写为

9.832000 1.55800 1.4895 0.0000

我也尝试过使用fixed（），但这没有帮助。如何停止此自动舍入/截断？

Answer 1

如果您的问题只是输出文件的重新排列（而不是计算的重新排列，则可以将输入值也保存为字符串，然后使用字符串重新排列输出文件。