c++ input,output

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You should be comfortable with the content in the modules up to and including the module "Input Output" for this project.

You must follow the style guidefor all projects.

For this project, download the text file weblog.txt
Note: To download this file, right click on the link and select SAVE AS

This file is an Apache web log taken from the web server for St. Mary‘s University. When a visitor goes to their web site, the visitor‘s browser makes a request to the web server to view a web page, which is a file residing on the server. Each time a page is requested by a browser, the web server records information about that request. This weblog.txt holds the details of some of those requests. See below for a list of fields with an example:

Web Log Example

This file does not include all possible information that could be collected by a web server. The full description of the apache log file format can be found here: http://httpd.apache.org/docs/2.2/logs.html

For this project, you can use each line of the web log file as one string using the string class‘ getline function.

Minimum Requirements:

• Create a non-member function to read each line of the web log file (4 points).
• Each line should then be stored in a vector such that the first element of the vector is the first line of the web log file. Because each element will hold an entire line from the file, the vector should be declared as a vector of strings (4 points).  Note: You must declare the vector in a function.
• Create another non-member function to sort the contents of the vector. Make sure to pass the vector by reference or your sort will dissappear when the function ends! (4 points).
• Create one more non-member function to write the contents of the vector to a file. Each element should be on its own line in the new file. The contents of the new file should look like the original input file once your program completes, but in sorted order (4 points).
• Create a main function that calls all of your non-member functions (4 points).

Answer

#include<iostream>
#include<sstream>
#include<fstream>
#include<vector>
#include<algorithm>

using namespace std;

木其工作室
void readFile(vector<string>& myVector);
void outFile(vector<string>& myVector);
void sortVector(vector<string>& myVector);

int main()
{
 vector<string> myVector;

 readFile(myVector);
 sortVector(myVector);
 outFile(myVector);

 system("pause");

 return 0;
}

void readFile(vector<string>& myVector)
{

 string line;
 ifstream myfile ("weblog.txt");

 if (myfile.is_open())
 {
  while( getline(myfile, line) )
  {
   myVector.push_back(line);
  }

  myfile.close();
  cout<<"File Read successfully."<<endl;
 }
 else
 {
  cout<<"Error"<<endl;
 }

}

void outFile(vector<string>& myVector)
{
  //writing to a file
  ofstream outFile;
  outFile.open("weblogSorted.txt");
  for(unsigned int i = 0; i<myVector.size(); i++)
  {
   outFile<<myVector[i]<<std::endl;
  }
  outFile.close();
  cout<<"Sorted elements written to a file."<<endl;
}

void sortVector(vector<string>& myVector)
{
 //sorting vector
  std::sort(myVector.begin(), myVector.end());
  cout<<"Vector sorted successfully successfully."<<endl;
}

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c++ input,output

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原文地址：http://www.cnblogs.com/oversea201405/p/3889301.html