Caesar cipher

[hitman_38]

I'm not sure where or how to use the infile. It is meant to open the file with outfile read it to the Plaintext buffer then it goes through the encryption/decryption changing to CipherText then write to the file.

I tried

outFile >> PlainText;

But it gives me an error
expected '(' before "outfile"
am I suppose to use this instead of

(!outFile.eof() << PlainText[100]);