const 变量不能在常量表达式中使用吗

const 变量不能在常量表达式中使用吗？

cpp
#include 
int main() {
    const int radius = 5;
    const double pi = 3.14159;
    const double circumference = 2 * pi * radius;
    std::cout << "The circumference of a circle with radius " << radius << " is: " << circumference << std::endl;
    return 0;
}