Use the file USpresStatesDict.dat to obtain a list of the presidents having a specified first name. See Fig. 5.43. If no president has the specified first name, that fact should be displayed.

The file Names.txt contains a list of first names in alphabetical order. Write a program that requests a name from the user and inserts the name into the file in its proper location. If the name is already in the file, it should not be inserted.