Question

C++ OPEN AND COPY FILES

Your task is to create a simple C++ program that prompts the user for two file names, opens both files, reads the data from one file and copies that data to the other file. After this is done, the files are both closed and the program ends.

1. Your program, opencopy.cpp, needs to use both an ifstream object and an ofstream object.

2. You only need to use #include for these but make sure that you also have using std::ifstream and using std::ofstream.

3. You will use string objects to get the filenames from the user. That should make it a lot easier .

4. If one or both of the files cannot be opened, you need to provide the user with an error message about that fact, including the offending name(s). It then needs to prompt the user for two more names and continue until the program can open both the input and output files.

5. If the program can only open one file, it needs to close() the other file before trying to open any new ones. You may also need to clear() the stream that failed to open, as in myInputFile.clear()

6. The program should use the getline() function to read data from the input file a line at a time and you can write it to the output file with the stream insertion (<<) operator.

7. The getline() function reads until it encounters a newline character. It takes the newline out of the stream and discards it. That means that you have to put the newlines back in to duplicate the original. This turns out to be easy. Let’s say that the string that you are reading data into is called big buffer and that your ofstream object is named output file. Then you can do something as simple as this output_file << (big_buffer + "\n");

8. Make sure that the program closes all open files before main executes the return statement.

Answer 1

Please find the code below:::

main.cpp

#include <iostream>
#include <string>
#include <fstream>
#include <sstream>

using namespace std;
int main( )
{
   ifstream infile;
   string line;//for read line
   char fileName[20];
   while(true){
       cout<<"Enter file name : ";
       cin>>fileName;
       infile.open (fileName); //name of file here. plz mention Complete path if file is not at root
       if (infile.is_open()) //if file opened
       {
           cout<<"Enter out file name : ";
           cin>>fileName;
           ofstream writer (fileName); //printing data to out file
           cout<<"File scan start........"<<endl;
           cout<<"Copying data ........"<<endl;
           while( getline(infile, line,'\n') ) { //get row from text file
               writer<<line<<endl;
           }
           infile.close(); //close file
           writer.close(); //close file
           cout<<"File scan done ........"<<endl;
           break;
       }
       else //if file not found show the below message
       {
           cout << "Sorry, we could not find the file.Please try again!!!!" << endl;
       }
   }

   return 0;
}

words.txt

This is a test string
HelloWorld
copy me if you can
hahah
ahhah
ahahhhahhahahah

output:

copyHere.txt now

This is a test string
HelloWorld
copy me if you can
hahah
ahhah
ahahhhahhahahah