Menghitung Volume Tabung C++

# include <iostream.h>

# include <conio.h>

void main ()

{

int r,t,volume;

const phi=3.14;

cout<< " PROGAM MENGHITUNG VOLUME TABUNG"<<endl;

cout<< " #######################################\n";

cout << " masukkan tinggi = ";

cin >> t;

cout << " masukkan jari-jari = ";

cin >> r;

volume = phi*r^2*t;

cout<< " jadi volume tabung adalah = "<<volume;

getch();

}