let rec longer (xs, ys) match (xs, ys) with | (_, []) -> true (* line 1 *) | ([],_) -> false (* line 2 *) | (_::xs,_::ys) -> longer (xs, ys) (* line 3 *) (a) For each of the following alternate orders of the branches, indicate one of the following: (A) The function would still be correct. (B) The function would still type-check (no unreachable branch) but would no longer be correct. (C) The function would no longer type-check (due to an unreachable branch). i. line 2; then line 1; then line 3 ii. line 3; then line 1; then line 2 iii. line 3; then line 2; then line 1 iv. line 1; then line 3; then line 2

let rec longer (xs, ys) match (xs, ys) with | (_, []) -> true (* line 1 ) | ([],_) -> false ( line 2 ) | (_::xs,_::ys) -> longer (xs, ys) ( line 3 *) (a) For each of the following alternate orders of the branches, indicate one of the following: (A) The function would still be correct. (B) The function would still type-check (no unreachable branch) but would no longer be correct. (C) The function would no longer type-check (due to an unreachable branch). i. line 2; then line 1; then line 3 ii. line 3; then line 1; then line 2 iii. line 3; then line 2; then line 1 iv. line 1; then line 3; then line 2

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

let rec longer (xs, ys)
match (xs, ys) with
| (_, []) -> true
(* line 1 *)
| ([],_) -> false
(* line 2 *)
| (_::xs,_::ys) -> longer (xs,ys) (* line 3 *)
=
(a) For each of the following alternate orders of the branches, indicate one of the following:
(A) The function would still be correct.
(B) The function would still type-check (no unreachable branch) but would no longer be correct.
(C) The function would no longer type-check (due to an unreachable branch).
i. line 2; then line 1; then line 3
ii. line 3; then line 1; then line 2
iii. line 3; then line 2; then line 1
iv. line 1; then line 3; then line 2

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