C + + Job 2-File stream object __c++

Job RequirementsGenerate random Data file text.txt. Sort after reading data from the file text.txt. Writes the sorted data to the In.txt file. Resolves a naming conflict problem when loading multiple-head files in a main program file. SolutionGenerate data by random generating function to write to the file stream, then read the file stream, speak the data in num[], sort, write the data in num[] to the new file, not open the STD namespace globally, use Std::xxx, and so on when calling. Code main.cpp

//  main.cpp
//  F-WORK2////
Created by Zyj on  2017/3/14.  copyright©2017 year Zyj. All rights reserved.

#include <iostream>
#include <string>
#include "file.hpp"

int main (int argc, const char * argv[])
{
    int n;
    Std::cin >> N;
    int *num = new Int[n];

    std::string text = "Text.txt";  
    std::string in = "In.txt";

    File F = file (text, n, num);

    F.randdate ();
    F.sortdate ();

    File F_ = file (in, n, num);

    F_.coutdate ();

    return 0;
}

file.hpp

//  file.hpp
//  F-WORK2////
Created by Zyj on  2017/3/14.  copyright©2017 year Zyj. All rights reserved.

#ifndef file_hpp
#define FILE_HPP

#include <stdio.h>
#include <string>
# Include <fstream>

class File
{
    std::string fileName;  filename
    int n;  data Volume
    int *num;

Public:
    File (std::string filename_, int n_, int *num_): FileName (Filename_), N (n_), num (num_) {}

    void Randdate ();  generate random data file filename
    void sortdate ();  read the random sequence in file filename and sort it into num
    void coutdate ();  store data in num in the filename file

    int random (double St, double ed);  generate st~ed random number
};

#endif/* FILE_HPP * *

File.cpp

File.cpp//F-WORK2////Created by Zyj on 2017/3/14. COPYRIGHT©2017 year Zyj.
All rights reserved. #include "file.hpp" #include <algorithm> #include <ctime> #include <cstdlib> #define S 0 #define T

    1000000//Generate random data file void File::randdate () {std::fstream fp (fileName, std::ios::out);
    while (!FP) {Fp.open (fileName, std::ios::out);

    } srand (Unsigned (time (0)));
    int k = n;
    while (k--) {FP << random (S, T) << ' \ n ';
} fp.close ();

    //Read data file, save num, and sort void file::sortdate () {std::fstream fp (fileName, std::ios::in);
    while (!FP) {Fp.open (fileName, std::ios::in);
    int k = 0;

    while (FP >> num[k++]) {} std::sort (num, num + N);
Fp.close ();

    ///Save data in num in file void File::coutdate () {std::fstream fp (fileName, std::ios::out);
    while (!FP) {Fp.open (fileName, std::ios::out);
   for (int i = 0; i < n; i++) {fp << num[i] << ' \ n ';
} fp.close (); //Generate random number, random number within st~ed int file::random (double St, double ed) {return (int) St + (ed-st) * rand ()/(Rand_max +
1.0); }