Main Answer:
The techniques that make code more reusable are I - Using constants instead of magic numbers, III - Writing multiple functions that solve small subproblems rather than one function that solves the entire problem.
Therefore, the correct answer is 1, 3.
Explanation:
Constants instead of magic numbers enhance code readability and maintainability by providing named values for numerical literals. This promotes easier understanding and modification of code, as changes can be made in one central location. Additionally, writing multiple functions to solve small subproblems (III) encourages modularization, making it easier to reuse specific functionalities across different parts of the codebase. This modular approach fosters maintainability, as updates or improvements to one function do not necessitate alterations to the entire codebase. It also supports a more structured and organized development process.
On the other hand, using specific values in functions instead of parameters (II) may lead to less reusable code. Functions with parameters allow for flexibility and adaptability, making them applicable to various scenarios. Finally, writing as few lines of code as possible (IV) is not necessarily a technique for enhancing code reusability. While concise code is desirable for clarity, focusing solely on minimizing lines may compromise readability and hinder the creation of modular, reusable components.
In conclusion, prioritizing the use of constants, modularizing code through multiple functions, and balancing conciseness with readability contribute to making code more reusable. These practices foster a codebase that is easier to understand, maintain, and adapt for future development.
Therefore, the correct answer is 1, 3.