Question

C++ Project

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

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.

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. Note: You must declare the vector in a function (main function or any other function) or you will lose all.

Create another non-member function to display the last 5 lines in the vector. You must pass the vector by reference!

Create another non-member function that will accept an integer line number in the parameter list and string return value. When the function is called in main, a line number must be passed to the function. The function should then return the line from the vector that corresponds to that line number. The first line in the file will be line 1.  You must pull the line from the vector, not from the file. Because you are required to pull the line from the vector, you must include the vector in the parameter list of this function and pass the vector to this function when it is called by main. The main function should then display the string that is returned by the function.

Create one more non-member function to write the contents of the vector to a file in reverse order. Again, you will need to pass the vector by reference to this function. Each element of the vector should be on its own line in the new file. The output file should look like the original file, but in reverse order (the last line in the original should be the first line in the output file).

Create a main function to test all of your non-member functions)

Answer 1

copy code

#include<iostream>
#include<fstream>
#include<vector>
using namespace std;
void readFile(vector<string> *ab)
{
string line;
ifstream in("weblog.txt");
while(getline(in,line))
(*ab).push_back(line);
//(*ab).at(20);
in.close();

}

void dispLast5(vector<string> ab)
{
for(int i=ab.size()-5;i<ab.size();i++)
cout<<ab.at(i)<<endl;
}

string getLine(vector<string> ab,int n)
{
return (ab.at(n-1));
}
void reverseWrite(vector<string> ab)
{
ofstream out("revweblog.txt");
for(int i=ab.size()-1;i>=0;i--)
{
out << ab.at(i)<<endl;
}
out.close();

}
int main()
{
vector<string> weblog;
readFile(&weblog);
dispLast5(weblog);
cout<<getLine(weblog,5);
reverseWrite(weblog);

}

screen short

1 #include« iostream» 2 #include(fstream» 3 #include(vector» 4 using namespace std; 5 void readFile (vector<string> *ab) 7 string line; 8 ifstream in("weblog.txt"); 9 while (getline(in,line)) 10 (ab) push_back (line); 11 //(*ab).at (2e); 12 in.close); 13 14 15 16 void dispLast5(vector<string> ab) 17 18 for(int i-ab.size()-5;i<ab.size();i++) 19 cout<<ab.at(i)<<endl; 20 21 22 string getLine(vector<string> ab,int n) 23 24 return (ab.at (n-1)); 25 26 void reversewrite(vector<string> ab) 27 28 ofstream out("revweblog.txt"); 29 for( inti-ab . size()-1;i>-ei--) 31 out << ab.at (i)<endl; 32 33 out.close(); 35 36 int main() 37 38 vector<string> weblog; 39 readFile (&weblog); 40 dispLast5 (weblog); 41 cout<<getLine(weblog,5); 42 reversewrite(weblog); 43