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.

Write a program that reads a data file that should contain only integer values and thus should contain only digits, plus or minus signs, and whitespace. The program should print any invalid characters located in the file, and at the end it should print a count of the invalid characters located.