Difference Between Top-down and Bottom-up Approach

In this post, we will understand the difference between top-down approach and bottom-up approach.

Top-down Approach

• In this approach, the problem is broken down into smaller parts.

• It is generally used by structured programming languages such as C, COBOL, FORTRAN.

• It may have redundancy since every part of the code is developed separately.

• There is less interaction and communication between the modules.

• Decomposition approach is used here.

• It is generally difficult to identify.

• The implementation depends on the programming language and platform.

• It is generally used with documentation of module and debugging code.

Bottom-up Approach

• In this approach, the smaller problems are solved.

• These solved problems are integrated to find the solution to a bigger problem.

• It is generally used with object oriented programming paradigm such as C++, Java, Python.

• Data encapsulation and data hiding is implemented in this approach.

• It is generally used in testing modules.

• Composition approach is used here.