C++ Programming Code to Encrypt Files

C++ Programming Code to Encrypt Files

Following C++ program ask to the user to enter file name to encrypt its content:

/* C++ Program - Encrypt File */
  
#include<iostream.h>
#include<conio.h>
#include<fstream.h>
#include<stdio.h>
#include<stdlib.h>
void main()
{
 clrscr();
 char fname[20], ch, choice;
 fstream fps, fpt;
 cout<<"Enter file name (with extension like file.txt) to encrypt : ";
 gets(fname);
 fps.open(fname);
 if(!fps)
 {
  cout<<"Error in opening file..!!";
  cout<<"\nPress any key to exit...";
  getch();
  exit(1);
 }
 fpt.open("temp.txt")
 if(!fpt)
 {
  cout<<"Error in creating temp.txt file..!!";
  fps.close();
  cout<<"\nPress any key to exit...";
  getch();
  exit(2);
 }
 while(fps.eof()==0)
 {
  fps>>ch;
  ch=ch+100;
  fpt<<ch;
 }
 fps.close();
 fpt.close();
 fps.open(fname);
 if(!fps)
 {
  cout<<"Error in opening source file..!!";
  cout<<"\nPress any key to exit...";
  getch();
  exit(3);
 }
 fpt.open("temp.txt");
 if(!fpt)
 {
  cout<<"Error in opening temp.txt file...!!";
  fps.close();
  cout<<"\nPress any key to exit...";
  getch();
  exit(4);
 }
 while(fpt.eof()==0)
 {
  fpt>>ch;
  fps<<ch;
 }
 cout<<"File "<<fname<<" encrypted successfully..!!";
 cout<<"\nPress any key to exit...";
 fps.close();
 fpt.close();
 getch();
}

When the above C++ program is compile and executed, it will produce the following output:



After running the above program, you can check your file that you have entered. You will see that your file's content will be encrypted.

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