Problem while Writing data into and Reading data ifrom a text file

I desperately need some help on this issue I am trying to perform Encryption and Decryption operation using a particular technique. The code is working perfectly. However i

am facing this problem; Once encryption process is performed the encrypted data is written into a file as shown below:

id=fopen('C:\Users\HOME\Desktop\I.txt','w');
fwrite(id,final); 
fclose(id);

FINAL is an array of ASCII characters in the range 1 to 256

and this is what i got as an answer for FINAL= xcpucmmucpxcfmc|ppxdpucpxcba

The file I.txt should have contained the same thing but it contained: xcpucmm€ucpxcfmc|ppxdpucpxcba

In the DECRYPTION part i read the file this way:

fid=fopen('C:\Users\HOME\Desktop\I.txt','r');
f=fscanf(dfid,'%c'); 
fclose(fid);

I proceded by using f (which contains the cipher text) in the decryption process only to get a wrong plaintext.

When i removed all the above codes and simply copied the ciphertext variable FINAL into the variable f in the decryption

process, i got the correct answer i.e

f=final;

My requirement is that both encryption and decryption process must use a text file.

Kindly Help Me !!

Answer 1

[Walter Roberson]

If you use fwrite() to write the file, you should probably use fread() to read the file.

Question: is "final" an array of characters in the range 1 to 256, or in the range 0 to 255? The 256 would give you problems.

[vikas]

"final" is an array that contains ASCII values in the range 1 to 256

[Jan]

There is no ASCII value for 256.

[Walter Roberson]

There are no ASCII values beyond 127.