TOWER OF HANOI

#include < stdio.h >
long int n;
void hanoi(char,char,char,int);

void main()
{
    char p1='1',p2='2',p3='3',ch;
    int nd;
    do
    {
        clrscr();

        printf("TOWER OF HANOI\n\n");

        printf("Enter number of disks : ");
        scanf("%d",&nd);
        n=0;
        hanoi(p1,p2,p3,nd);

        printf("Total number of operation performed to transfer %d disks = %ld\n",nd,n);

        printf("\n\n\nDo you want to continue (y/n?) : ");
        ch=getch();

    }while(ch=='y'||ch=='Y');
}
void hanoi(char p1,char p2,char p3,int nd)
{
    if(nd==1)
    {
        n++;
        printf("Move disk = %d from Peg %c to Peg %c\n",nd,p1,p2);
        return;
    }
    hanoi(p1,p3,p2,nd-1);
    n++;
    printf("Move disk = %d from Peg %c to Peg %c\n",nd,p1,p2);
    hanoi(p3,p2,p1,nd-1);
}