For Exercises 15 through 19, use the incremental development methodology to implement th...

For Exercises 15 through 19, use the incremental development methodology to implement the program. For each exercise, identify the program tasks, create a design document with class descriptions, and draw the program diagram. Map out the development steps at the start. Present any design alternatives and justify your selection. Be sure to perform adequate testing at the end of each development step.

Write a mail merge application. You use two files for this program. The first is a text file that contains a template letter in the following style:

The tags <<N>>, <<A>>, and <<G>> are placeholders for the person’s name, age, and gender. The second file contains the name, age, and gender information of people to whom you want to send a letter. Use whatever format you wish for the second file. Read two files and print out the letter with the placeholders replaced by the actual values from the second file. Run the program multiple times, each time using a different template file. For this program, output the personalized letter to a customized frame. Add menus to this frame so the user can save personalized letters to files (one personalized letter to a file).