Question

C++ program

The aim of this assignment is to practice writing recursive functions. For this homework assignment write two recursive functions: The first one receives a vector of File pointers and recursively outputs properties of every file stored inside this vector. The second function receives a vector of File pointers and a string which represents a type of the file (gif or txt). The function should return another vector of File pointers containing only Image files or Text files, depending on the second parameter. The function should be recursive.

Answer 1

Hi,

The problem has been resolved. Two functions have been created named "fileProp1" and "fileProp2". One method has only one argument "vector" and the second method have two arguments "vector and string". To show the file property,I'm printing the size of file. Both methods are recursive.

Output screenshot has been attached below, Please refer to that for better understanding.

Code:

------------------------

#include<fstream>
#include<vector>
#include<iostream>
using namespace std;

void fileProp1(vector<ifstream*> files){

     
   if(files.size()==0){
       return;
   }
     
   ifstream* file= files.at(0);

   if(!file->is_open())
{
return;
}

file->seekg(0, ios::end);
int fileSize = file->tellg();
file->close();

   cout<< "\nsize: " << fileSize << endl;

  
   files.erase (files.begin());

   fileProp1(files);
}

void fileProp2(vector<ifstream*> files, string type){

     
   if(files.size()==0){
       return;
   }
     
   ifstream* file= files.at(0);

   if(!file->is_open())
{
return;
}

file->seekg(0, ios::end);
int fileSize = file->tellg();
file->close();

   cout<< "\nsize: " << fileSize << endl;

  
   files.erase (files.begin());

   fileProp2(files,"txt");
}

int main()
{
   vector<ifstream*> files;

   ifstream f("file.txt");
   ifstream f1("file1.txt");
   ifstream f2("HomeworkLib1.gif");
   files.push_back(&f);
   files.push_back(&f1);
   files.push_back(&f2);

   cout<<"\nvecto only method:\n";
   fileProp1(files);

   vector<ifstream*> files1;
   ifstream f5("file.txt");
   ifstream f6("file1.txt");
   files1.push_back(&f5);
   files1.push_back(&f6);

   cout<<"\nvector and string method:\n";
   fileProp2(files1,".txt");

}

------------------------

The problem has been resolved, I hope you will like the solution. If you have any question or query regarding this problem or other, please comment below and give the positive rating.

Thank You!! Happy Learning!! Keep Chegging!!