What is the difference between constexpr and const in C++?

What is the difference between constexpr and const in C++?

In C++, const defines a constant variable whose value cannot be changed, while constexpr indicates that the value can be evaluated at compile time.

Can you give me an example of how to use constexpr?

Sure! Here's an example:

constexpr int square(int x) {
    return x * x;
}

int main() {
    constexpr int result = square(5);
}

Are there any limitations to using constexpr?

Yes, constexpr functions must have a return type and contain only a single return statement. They also cannot modify any variables.

When should I use const instead of constexpr?

Use const when you need a constant value that doesn't need to be evaluated at compile time, such as runtime constants.