Question

ok here is my homework

This assignment focuses on file streams.

Your program will accept the name of an input file from the user, and the name of an output file from the user. You may assume the input file contains no more than 100 lines.

Your program will write the lines of the input file to the output file in reverse line order, i.e. the first line of the input file becomes the last line of the output file, the second line of the input file becomes the second-to-the-last line of the output file, and so forth. Note that the lines themselves are not reversed, only the order in which the lines appear.

Answer 1

NOTE : FEEL FREE TO ASK ANY DOUBTS IN THE COMMENT SECTION

input.txt

CODE

#include <iostream>
#include <fstream>
#include <sstream>
using namespace std;
int main(){
   // variables to store file names
   char in[20],out[20];
   // filestream variables
   fstream infile,outfile;
   cout << "\n Enter Input Filename: ";
   cin >> in;   // reading input file name
   cout << "\n Enter Output Filename: ";
   cin >> out;// reading output file name
   // opening infile in read mode
   // opening outfile in write mode
   infile.open(in,ios::in);
   outfile.open(out,ios::out);
   // if unable to open file showing error
   // and also exit from program
   if(!infile.is_open() || !outfile.is_open()){
       cout << "Error while Opening or Creating file";
       return 0;
   }
   int count=0;   // variable to store current file lines count
   string line="";// to store line
   // Loop until file does not reach end of file
   while(getline(infile,line))
   {
       // increase line count
       count = count + 1;
   }
   // closing file and opens again in read mode
   infile.close();
   infile.open(in,ios::in);
   // string array to store lines
   string lines[count];
   // starting index of array from end
   int index=count-1;
   // Loop until doesnot reaches end of file
   while(getline(infile,line)){
       // adding line to lines array at index
       lines[index]=line+"\n";
       index=index-1; // decrementing index
   }
   // writing lines in reverse order to outfile
   for(int i=0;i<count;i++){
       outfile << lines[i];// writing to file
   }
   // Closing infile adn outfile
   infile.close();
   outfile.close();
   cout << "\n Data Successfully Inserted";
   return 0;
}

OUTPUT in CONSOLE

output.txt

CODE in EDITOR

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