What this will print?

trivia.cpp

#include <iostream>

class A {
public:
    void foo(float x) {
        std::cout << x << " is a float." << std::endl;
    }
};

class B : public A {
public:
    void foo(long x) {
        std::cout << x << " is a long." << std::endl;
    }
};

int main() {
    float x = 1.5;
    B b;
    b.foo(x);
}