Write a program, that reads a file named quote.dat and encrypts that file, (usin

Question

Write a program, that reads a file named quote.dat and encrypts that file, (using a basic encryption) and stores it in a file named encryp_quote.dat. Then your program must read encryp_quote.dat, decrypt it and store it in a file named decryp_quote.dat. After the program is ran, you should be able to examine all three *.dat files. You must use a quote of Albert Einstein and Yogi Berra in your quote.dat file and of course, the quote you use must begin with a capital letter and end with a period, question mark or exclamation point.

Quotes to be used:

Yogi Berra quote "You've got to be very careful if you don't know where you are going because you might not get there."

Albert Einstien qoute

Explanation / Answer

#include<stdio.h>

#include<string.h>

#include<stdlib.h>

/* For exit() function*/

int main()

{

char c[1000],a[1000];

FILE *fptr,*fp,*f,*fpp;

if ((fptr=fopen("quote.dat","r"))==NULL)

{

printf("Error! opening file");

exit(1);

}

fscanf(fptr,"%[^ ]",c);

// file in string c

fclose(fptr);

int n;

n=strlen(c);

int i;

for(i=0;i<n;i++)

c[i]=c[i]+3;

//file encrypted

fp = fopen("encryp_quote.dat", "w+");

fputs(c, fp);

fclose(fp);

//encrypted file written to file

if ((f=fopen("encryp_quote.dat","r"))==NULL)

{

printf("Error! opening file");

exit(1);

}

fscanf(f,"%[^ ]",a);

fclose(f);

for(i=0;i<n;i++)

a[i]=a[i]-3;

// decrypting and written back to file

fpp = fopen("decrypt_quote.dat", "w+");

fputs(a, fpp);

return 0;

}

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