Tính n giai thừa - C/C++

#include <stdio.h>

#include <conio.h>

    int giaithua(int n)

{

                int i,gt=1;

                for(i=1;i<=n;i++)

                {

                                gt*=i;

                }

                return gt;

}

void main()

{ printf("*************************************");

    printf("\n CHUONG TRINH TINH N GIAI THUA");

    printf("\n*************************************");

                int n;

                printf("\nNhap n: ");

                scanf("%d",&n);

                printf("n! = %d\n",giaithua(n));

                getch();

}