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Difference Between Top-down and Bottom-up Approach
In the top-down approach, a bigger module/problem is divided into smaller modules. In contrast, in the bottom-up approach, the smaller problems are solved and then they are integrated to find the solution of a bigger problem.
Read this article to learn more about top-down approach and bottom-up approach and how they are different from each other.
What is Top-Down Approach?
Top-Down Approach is an approach to design algorithms in which a bigger problem is broken down into smaller parts. Thus, it uses the decomposition approach. This approach is generally used by structured programming languages such as C, COBOL, FORTRAN.
The drawback of using the top-down approach is that it may have redundancy since every part of the code is developed separately. Also, there is less interaction and communication between the modules in this approach.
The implementation of algorithm using top-down approach depends on the programming language and platform. Top-down approach is generally used with documentation of module and debugging code.
What is Bottom-Up Approach?
Bottom-Up Approach is one in which the smaller problems are solved, and then these solved problems are integrated to find the solution to a bigger problem. Therefore, it uses composition approach.
It requires a significant amount of communication among different modules. It is generally used with object oriented programming paradigm such as C++, Java, and Python. Data encapsulation and data hiding is also implemented in this approach. The bottom-up approach is generally used in testing modules.
Difference between Top-Down Approach and Bottom-Up Approach
The following table highlights all the major differences between top-down approach and bottom-up approach −
S.No. |
Top-Down Approach |
Bottom-Up Approach |
|---|---|---|
1. |
In this approach, the problem is broken down into smaller parts. |
In this approach, the smaller problems are solved. |
2. |
It is generally used by structured programming languages such as C, COBOL, FORTRAN, etc. |
It is generally used with object oriented programming paradigm such as C++, Java, Python, etc. |
3. |
It is generally used with documentation of module and debugging code. |
It is generally used in testing modules. |
4. |
It does not require communication between modules. |
It requires relatively more communication between modules. |
5. |
It contains redundant information. |
It does not contain redundant information. |
6. |
Decomposition approach is used here. |
Composition approach is used here. |
7. |
The implementation depends on the programming language and platform. |
Data encapsulation and data hiding is implemented in this approach. |
Conclusion
The most significant difference between the two is that the top-down approach is mainly used in structure programing languages like C, COBOL, etc., while the bottom-up approach is used in object oriented programming languages like C++, Java, Python, etc.
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