Data Filters. Programs called data filters are often used to read the information in a dat...

Data Filters. Programs called data filters are often used to read the information in a data file and then analyze the contents. In many cases, this data filter program is designed to remove any data errors that would cause problems with other programs that read the information from the data file. The next set of programs is designed to perform error checking and data analysis on information in a data file. Generate data files to test all features of the programs.

Developing secret codes has interested people for centuries. A simple coding scheme can be developed by replacing each character in a text file by another character that is a fixed number of positions away in the collating sequence. For example, if each character is replaced by the character that is two characters to its right in the alphabet, then the letter a is replaced by the letter c, the letter b is replaced by the letter d and so on. Write a program that reads the text in a file and then generates a new file that contains the coded text using this scheme. Change only the alphanumeric characters.