A program without any iteration statement is executed sequentially, in the order

A program without any iteration statement is executed sequentially, in the order in which the sentences are written in the source code or algorithm. These sentences are called sequential.
Discuss why it is important to write code with future maintainability in mind. What kinds of maintenance might be done on an existing program? Tip: Your answers might include fixing bugs, adding new features, improving efficiency, improving the user interface, and making the program interface with another program.
Also, discuss the importance of planning out a program on paper before writing the actual code. What are some advantages of doing this?

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