A. Business, scientific, and entertainment systems are inherently complex. It is a well-known fact that systems can be better understood by breaking them down into individual tasks. Share how a programmer would use "top-down design" to understand better how a computer program should be designed. How do hierarchy charts aid the programmer?

B. Computers process data. Some data are numbers; some are strings. Distinguish between numbers and strings. How does a programmer tell the computer whether a variable is a number or a string?