Writing and Using Libraries

• Virtually all programs are linked against one or more libraries.Any program that uses a C function (such as printf or malloc) will be linked against the C runtime library.
• If your program has a graphical user interface (GUI), it will be linked against windowing libraries.
• In each of these cases, you must decide whether to link the library statically or dynamically.
• If you choose to link statically, your programs will be bigger and harder to upgrade. If you link dynamically, your programs will be smaller, easier to upgrade.