The approach used in top down analysis and design is năm 2024
A common difficulty encountered when trying to solve a complex problem, is the tendency to focus on the details too soon. There are several critical disadvantages to this: Show
Although technically there are some differences, we will treat the terms "top-down problem analysis", "top-down design", and "functional decomposition" as being identical, within this material. The product of top-down design is a sequence of successively more detailed algorithm modules (as demonstrated below). Each algorithm module performs a single task which, combined with other modules and basic tasks, provide the solution to a more general module or to the original problem. Demonstrations of Top-Down DesignExample 1: Simple Linear Logic Most simple linear logic problems can be "decomposed" into 3 sub-problems: General_Linear_Logic Get Input Values [Perform Calculations] (using Input Values) DISPLAY Output END Example 2: Determining an employee's pay based on hours worked and pay rate (and using some company standard values for overtime). Notice that, in these examples, modules (elements which require further expansion) have been numbered for reference purposes. Employee_Pay
1. Get_Employee_Pay_Values
2. Calculate_Net_Pay
2.1 Calculate_Gross_Pay
2.2 Calculate_Total_Deductions
Example 3: Determine the total payroll (total of net pay) for all employees of some company. (Having solved a simple problem before, we can use the components of this simpler problem to solve this more complex one). Determine_Payroll set totalPayroll to zero
2. Process_One_Employee
Since the two sub-modules within this solution algorithm have already been developed, there is no need to repeat this analysis (although the module numbering would change). What is the topA "top–down" approach is where an executive decision maker or other top person makes the decisions of how something should be done. This approach is disseminated under their authority to lower levels in the hierarchy, who are, to a greater or lesser extent, bound by them. What is the topThe top-down approach starts with an overall design and gradually drills down into smaller components, while the bottom-up approach starts with small components and gradually combines them to form a larger system. Depending on what type of application you are building, you have to decide which way would be best. What is top down design and how does it help manage abstraction?Top down program design is an approach to program design that starts with the general concept and repeatedly breaks it down into its component parts. In other words, it starts with the abstract and continually subdivides it until it reaches the specific. Consider creating the prime factorization of a number like 1540. |