math.cpp, some math calculations

//math.cpp
//Creative Commons copyright (c) Lauri Friberg 2010, 2014, 2018
//Converted from C to C++ on 15.9.2018 at 16:23 hours, (2018/9/15, September the 15th of 2018 at 4:23 PM).

//#include <stdio.h>
#include <iostream>
using namespace std;

int main() {

float a, b, c, x, y;

cout << "a="; cin >> a;
cout << "b="; cin >> b;
cout << "c="; cin >> c;
cout << "x="; cin >> x;

y = a*x*x+b*x+c;
cout << "y=ax²+bx+c=" << y << "\n";

return 0;
}