float Harmean(float a, float b);
int main()
{
float x = 1.f, y = 1.f, harm;
while (x != 0 && y != 0)
{
cout << "enter two number,first:";
cin >> x;
cout << "enter two number,second:";
cin >> y;
harm = Harmean(x, y);
if (x != 0 && y != 0)
cout << x << "和" << y << "的调和平均数为" << harm << endl;
};
}
float Harmean(float a, float b)
{
float har = (2 * a * b) / (a + b);
return har;
}