1. Write a program that writes the lowercase letters of the English alphabet, one character at a time, to a file. Read back the fi le to display each letter but in uppercase. 2. Write a program that...

1. Write a program that writes the lowercase letters of the English alphabet, one character at a time, to a file. Read back the fi le to display each letter but in uppercase.

2. Write a program that accepts three lines of text from user input and saves them to a fi le foo. Reopen the fi le to add three more lines and finally display all six lines.

3. Write a program that double-spaces a fi le whose name is input by the user. The output filename will have the “.new” suffix affixed to the input filename.