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move(int n,int x,int y,int z)
{
    if(n==1)
      printf("%c-->%c\n",x,z);
    else
    {
      move(n-1,x,z,y);
      printf("%c-->%c\n",x,z);
      move(n-1,y,x,z);
    }
}
main()
{
    int h;
    printf("\ninput number:\n");
    scanf("%d",&h);
    printf("the step to moving %2d diskes:\n",h);
    move(h,'a','b','c');
}
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