GATE CS 2021 Set 1 — Question 14
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Compiler Design → Runtime Environments → Activation Records
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Question
Consider the following statements.
: The sequence of procedure calls corresponds to a preorder traversal of the activation tree.
: The sequence of procedure returns corresponds to a postorder traversal of the activation tree.Which one of the following options is correct?
: The sequence of procedure calls corresponds to a preorder traversal of the activation tree.
: The sequence of procedure returns corresponds to a postorder traversal of the activation tree.Which one of the following options is correct?
Correct answer
(C) S₁ is true and S₂ is true
Solution
In an activation tree, each node represents an activation of a procedure.
1.A procedure call corresponds to entering a node in the tree. Since we visit a node before its children in a preorder traversal, the sequence of calls corresponds to a preorder traversal.
2.A procedure return corresponds to leaving a node after all its sub-calls (children) have completed. This matches the definition of a postorder traversal, where a node is visited after all its descendants.
Therefore, both and are true.Continue learning with Success Tracker
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