tính n!

include < conio.h >

#include < iostream.h >

/*Ham tra ve so nguyen tinh n! (Factorial)*/

long int Fac(int n) {

    if (n == 0) return 1;

    else return n * Fac(n - 1);

}

/*Chuong trinh chinh*/

void main() {

    clrscr();

    int n;

    cout << "Nhap vao gia tri cua n = ";

    cin >> n;

    cout << n << "! = " << Fac(n);

    getch();

}