C++ Caesar Cipher

Hellos need help with writing a code to break a file in Caesar cipher. However , i got a couple of source file you can look at and copy (put together ) the codes in one file meeting the requirements for the Caesar cipher then report how many weird characters or wrong words in the input file . Attached is a flowchart showing how the program will work please only do the Caesar Cipher on the left side. 

ok so what you need to do is look at the four file source , each file does something different but at the same time they do a little bit of Caesar Cipher and other things, so you need to look at them and create a program that meets the flowchart. You need to read in a file called ciphershift, break the coded words in the file , to break them you need to know how mnay shifts by testing the number of shifts, from 0 to 26 ( the number of letters ) by actually puting the number of shifts in the code. then look for any words that are not making since or don't exist in the dictionary, then report it in an outputfile or something. Let me know if you got any questions. 

I got the source file but it is not complete , I just need you to complete it from the four source files please

The input file name is ciphershift.txt