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Why is there return in evalExpr function?

What would be the base case?

Prove that the algorithms printExpression and evalExpr print out and evaluate an arithmetic expression represented by a binary tree. Hint: Use induction and the recursive definition of a binary tree.

Evaluate Arithmetic Expressions o Specialization of a postorderAlgorithm evalExpr(v) traversal if v.isExternalO a recursive method returning return v.elementO the value of a subtree else when visiting an internal node, combine the values of the subtrees x ← evalExpr(v.leftO) yevalExpro.righo) ← operator stored at v return x ◇y 5 1

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