Answer:
Write the Source Code: Enter the following source codes using a programming text editor (such as NotePad++ for Windows or gEdit for UNIX/Linux/Mac) or an Interactive Development Environment (IDE) (such as CodeBlocks, Eclipse, NetBeans or MS Visual Studio - Read the respective "How-To" article on how to install and get started with these IDEs).
Do not enter the line numbers (on the left panel), which were added to help in the explanation. Save the source file as "Hello.c". A C source file should be saved with a file extension of ".c". You should choose a filename which reflects the purpose of the program.
The answer is A, they are used for photos
Answer: It is a series of instructions contained in one command that users can apply to automate complex and/or repetitive tasks
One example would be a macro that goes through a list of numbers and highlights which are duplicates. Say you had the list {1,2,3,3,4,4,4,5}. You could use one color to highlight both 3 and 4 as they repeat themselves. Or you could use different colors to show the different values. With a small list, you could highlight by hand. However, macros are more efficient with larger lists.