fibonacci.cpp

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#include <cstdint>
#include <cassert>   
#include <iostream>  

namespace math {
namespace fibonacci {
uint64_t fibonacci(uint64_t n) {
    // If the input is 0 or 1 just return the same (Base Case)
    // This will set the first 2 values of the sequence
    if (n <= 1) {
        return n;
    }
 
    // Add the preceding 2 values of the sequence to get next
    return fibonacci(n - 1) + fibonacci(n - 2);
}
}  // namespace fibonacci
}  // namespace math

static void test() {
    assert(math::fibonacci::fibonacci(0) == 0);
    assert(math::fibonacci::fibonacci(1) == 1);
    assert(math::fibonacci::fibonacci(2) == 1);
    assert(math::fibonacci::fibonacci(3) == 2);
    assert(math::fibonacci::fibonacci(4) == 3);
    assert(math::fibonacci::fibonacci(15) == 610);
    assert(math::fibonacci::fibonacci(20) == 6765);
    std::cout << "All tests have passed successfully!\n";
}

int main() {
    test();  // run self-test implementations
    return 0;
}