Write a C++ program to Implement the encryption and decryption functions for suc

Question

Write a C++ program to Implement the encryption and decryption functions for such a scheme that will split the original file into two new files and vice versa. One of these two new files will containt all the characters in the original file in odd position and the other will contain all characters in the even position. For example, if the original file contained the text: Hello World! then the 1st file would contain : HloWrd and the 2nd file would contain: el ol!

1st function:

void split(char sourceFile[ ], char destFile1[ ], char dest File2[ ]);

Function Should:

I. open sourceFile as an input file stream

II. Open destFile2 and destFile2 as output file streams

III. Read each character from sourceFile

IV. If it's an even numbered character (starting at zero), place it in destFile1

V. Else place it in destFile2

VI. Close the files.

2nd function:

void merge(char sourceFile1[ ], char sourceFile2[ ], char destFile[ ]);

Function Should:

reverse the previous operations

Testing:

I Ask the user for the name of the input file

II. Ask the user for teh names of the two half files

III. Call the split function with the filenames as parameters

IV. Ask the user for the name for the recombined file

V. Call the merge function with the appropriate filenames as parameters

Also:

Give detailed directions and warnings to user

Check to see if file opened correctly

Reset teh file pointers to re-check the file existance (if needed)

Close the output file

Redundancies for file permissions and pre-existent files to prevent overwrite

Explanation / Answer

//#include "stdafx.h"
#include <fstream> //srand
#include <ctime> //time
#include <cmath>
#include <iostream>
using namespace std;
void split(char sourceFile[], char destFile1[], char destFile2[]){
int line;
ifstream s(sourceFile);
ofstream f1(destFile1);
ofstream f2 (destFile2);
if (s.is_open()&&f1.is_open()&&f2.is_open())
{
int i=0;
char t[0];
while ( s.peek()!=EOF )
{
s.read(t,1);
if(i%2==0){
f2<<t[0];
}else{
f1<<t[0];
}
}
s.close();
f1.close();
f2.close();
}

else {cout << "Unable to open file";
}
}
void merge(char sourceFile[], char destFile1[], char destFile2[]){
int line;
ofstream s(sourceFile);
ifstream f1(destFile1);
ifstream f2 (destFile2);
if (s.is_open()&&f1.is_open()&&f2.is_open())
{
int i=0;
char t[0];
while ( f1.peek()!=EOF&&f1.peek()!=EOF )
{

if(i%2==0){
f2.read(t,1);
s<<t[0];
}else{
f1.read(t,1);
s<<t[0];
}
}
s.close();
f1.close();
f2.close();
}

else {cout << "Unable to open file";
}
}
int main(){
char s[200],f1[200],f2[200];
cout<<"Enter the source file name: ";
cin>>s;
cout<<"Enter the destination file name1: ";
cin>>f1;
cout<<"Enter the destination file name2: ";
cin>>f2;
split(s,f1,f2);
return 0;
}

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