case 2:{ if(h==-1) nodata(); else output(h);break; }

case 2:{ if(h==-1) nodata(); else output(h);break; }:\vc++\lianbiao.cpp(154) :error C2664:'output' :cannot convert parameter 1 from 'int' to 'struct node *'Conversion from integral type to pointer type requires reinterpret_cast,C-style cast or function-style cast怎么改?