foo.cc: In function 'node* insert(node*, int)':
foo.cc:24:13: warning: statement has no effect [-Wunused-value]
   24 |         for(scp;scp!=NULL;prescp=scp,scp=scp->next)
      |             ^~~
foo.cc: In function 'int main()':
foo.cc:64:13: warning: statement has no effect [-Wunused-value]
   64 |         for(p;p<a+n;p++)
      |             ^

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