Use namespace std
int square(int x，int y)；
Floating square (floating x, floating y);
Double square (double x, double y);
int main()
{
//test
cout & lt& ltsquare(2，4)& lt； & ltendl
cout & lt& ltsquare(2. 1f，4.5f)& lt； & ltendl// Note that the value in this place should be followed by f.
cout & lt& ltsquare(2. 1，4.5)& lt； & ltendl
Returns 0;
}
int square(int x，int y)
{
cout & lt& lt" int:"； //Proof
Returns x * x+y * y；;
}
Floating square (floating x, floating y)
{
Cout & lt& lt "floating"; //Proof
Returns x * x+y * y；;
}
Double square (double x, double y)
{
cout & lt& lt" double:"； //Proof
Returns x * x+y * y；;
}