Question

Write a C++ program that reverses a file. More specifically, given an input file (input.txt) your program will reverse every line in the input. This program does not have an output file, as it modifies the input file directly. You may assume that your input file has 1000 lines or less, if this helps.

sample input:

Hello World!

I study C++

following output:

!dlroW olleH

++C yduts I

Answer 1

input.txt(Save the file under D Drive.Then the path of th efile pointing to it is D:\\input.txt )

Hello World!
I study C++

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#include <iostream>
#include <cmath>
#include <fstream>
#include <string>

using namespace std;

int main()
{
//defines an input stream for the data file  
ifstream dataIn;
  
//Declaring variables
string rev_string="";
string str;
  
//Opening the input file
dataIn.open("D:\\input.txt");
  
/* This loop will get each line from
* the file and reverse it and displayed
* on the console
*/
while(getline(dataIn, str,'\n') )
{
   rev_string="";
   //This for loop will reverse the string
for(int i=str.length()-1;i>=0;i--)
{
rev_string+=str.at(i);
}
//Displaying the output
cout<<rev_string<<endl;

}
  
  
return 0;
}

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_______________Thank You