/in/foo.cc: In function 'node* insert(node*, int)':
/in/foo.cc:24:9: warning: statement has no effect [-Wunused-value]
  for(scp;scp!=NULL;prescp=scp,scp=scp->next)
         ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:64:7: warning: statement has no effect [-Wunused-value]
  for(p;p<a+n;p++)
       ^