Problem
1. We have used several data types in the programs in this chapter. Write a short program to use and test them.
2. Write a short program to test memory functions we used in this chapter.
3. There are several functions in UNIX that can be used to retrieve host information, such as the IP address and port number-for example, get host by name, get host by address, get serve by name, and get serve by port. Try to find some information about these functions and use them in a short program.