1. If an existing file is opened in append mode, what happens to the file’s existing contents? 2. In most languages, if a file does not exist and a program attempts to open it in append mode, what...

1. If an existing file is opened in append mode, what happens to the file’s existing contents?

2. In most languages, if a file does not exist and a program attempts to open it in append mode, what happens?

3. What is the purpose of the eof function that was discussed in this chapter?

4. What is control break logic?