Breaking Caesars Cipher with Brutal Force

In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.

Given an arbitrary cipher text file, you need to write a C++ program to find out the value of the shift, and decrypt the cipher text to plaintext. You must not hard code the cipher text nor any shift values in your program. Test your program with a sample cipher text here (only the alphabetic letters are changed):

Ty ncjaezrclasj, pyncjaetzy td esp acznpdd zq eclydqzcxtyr tyqzcxletzy (cpqpccpo ez ld awltyepie) fdtyr ly lwrzctesx (nlwwpo ntaspc) ez xlvp te fycplolmwp ez lyjzyp pinpae eszdp azddpddtyr dapntlw vyzhwporp, fdflwwj cpqpccpo ez ld l vpj. Esp cpdfwe zq esp acznpdd td pyncjaepo tyqzcxletzy (ty ncjaezrclasj, cpqpccpo ez ld ntaspcepie).

Please give me source code and screenshot showing the execution of the program. Please use I/O file to read file name cipher.txt and output file name plain.txt