Ace Your C++ Skills 2025 – Rock the ‘Thinking in C++’ Challenge!

Question: 1 / 565

Why should you prefer const over #defines for value substitution in C++?

For type safety

Using constants declared with the keyword "const" is an overall better practice compared to using #define macros for value substitution in C++. This is because const values have defined types, and are evaluated at the time of declaration, while #defines are evaluated during preprocessing. This means that #defines have no type and their values are not checked for correctness until runtime. Additionally, const values can have functions applied to them, while #defines cannot. Option B is incorrect because const values do not necessarily make the code simpler, but they do make it more predictable and maintainable. Option C is also incorrect because #defines do not use memory as they are directly replaced with their values during preprocessing. Option D is incorrect because C++ has its own way of defining constants using the keyword "const", so compatibility with C is not a valid reason to prefer #defines over const.

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For simplicity

For memory efficiency

For compatibility with C

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