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s a terminal node
// if it is a terminal node, only num type will have value
// in the data field.
// There is nothing to do.
}
else { // this is a nonterminal node
for (i=0; i < curr->child_cnt ; i++)
evaluate_tree(curr->children[i]) ;
switch ( curr->rno_used ) {
case 0: curr->val =
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