OCaml Code: Please fix the pop command error that is attached. Don't reject the question because this is not a graded work. Below is the code along with the test cases. Make sure to show the correct code with the screenshot of the test cases being passed. interpreter.ml type stackValue = BOOL of bool | INT of int | ERROR | STRING of string | NAME of string | UNIT type command = ADD | SUB | MUL | DIV | PUSH of stackValue | POP | REM | NEG | TOSTRING | SWAP | PRINTLN | QUIT letinterpreter (input, output) = let ic = open_in input in let oc = open_out output in letrec loop_read acc = try let l = String.trim(input_line ic) in loop_read (l::acc) with | End_of_file -> List.rev acc in let strList = loop_read [] in let str2sv s = match s with | ":true:" -> BOOL true | ":false:" -> BOOL false | ":error:" -> ERROR | ":unit:" -> UNIT | _-> let rec try_parse_int str = try INT (int_of_string str) with | Failure _ -> try_parse_name str and try_parse_name str= NAME str in try_parse_int s in (* Helper function: file output function. It takes a bool value and write it to the output file. *) let file_write bool_val = Printf.fprintf oc "%s\n" bool_val in letstr2com s = match s with | "Add" -> ADD | "Sub" -> SUB | "Mul" -> MUL | "Div" -> DIV | "Swap" -> SWAP | "Neg" -> NEG | "Rem" -> REM | "ToString" -> TOSTRING | "Println" -> PRINTLN | "Quit" -> QUIT | _ -> PUSH (str2sv s) in let com2str c = match c with | "Add" -> ADD | "Sub" -> SUB | "Mul" -> MUL | "Div" -> DIV | "Swap" -> SWAP | "Neg" -> NEG | "Rem" -> REM | "ToString" -> TOSTRING | "Println" -> PRINTLN | "Quit" -> QUIT | _ -> PUSH (str2sv c) in let sv2str sv = match sv with | BOOL b -> string_of_bool b | INT i -> string_of_int i | ERROR -> ":error:" | STRING s -> s | NAME n -> n in let comList = List.map str2com strList in let stack = ref [] in (* Initialize an empty stack *) letprocessor cl stack = match (cl, stack) with | (ADD::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(a+b)::restOfStack) | (ADD::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (SUB::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(a-b)::restOfStack) | (SUB::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (MUL::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(a*b)::restOfStack) | (MUL::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (DIV::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(a/b)::restOfStack) | (DIV::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (REM::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(a%b)::restOfStack) | (REM::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (SWAP::restOfCommands, x::y::restOfStack) -> processor restOfCommands y::x::restOfStack | (SWAP::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (NEG::restOfCommands, INT(a)::restOfStack) -> processor restOfCommands ( INT(-a)::restOfStack) | (NEG::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (TOSTRING::restOfCommands, x::restOfStack) -> processor restOfCommands ( (sv2str x)::restOfStack) | (TOSTRING::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (PUSH sv::restOfCommands, _) -> processor restOfCommands (sv::stack) | (POP sv::restOfCommands, hd::restOfStack) -> processor restOfCommands restOfStack | (POP sv::restOfCommands, _) -> processor restOfCommands (ERROR::stack) | (PRINTLN::restOfCommands, STRING(a)::restOfStack) -> file_write (a);processor restOfCommands (ERROR::stack) | (PRINTLN::restOfCommands, []) -> processor restOfCommands (ERROR::stack) in processor comList [] Test cases Test cases: input1.txt: push 1 toString println quit

OCaml Code: Please fix the pop command error that is attached. Don't reject the question because this is not a graded work. Below is the code along with the test cases. Make sure to show the correct code with the screenshot of the test cases being passed. interpreter.ml type stackValue = BOOL of bool | INT of int | ERROR | STRING of string | NAME of string | UNIT type command = ADD | SUB | MUL | DIV | PUSH of stackValue | POP | REM | NEG | TOSTRING | SWAP | PRINTLN | QUIT letinterpreter (input, output) = let ic = open_in input in let oc = open_out output in letrec loop_read acc = try let l = String.trim(input_line ic) in loop_read (l::acc) with | End_of_file -> List.rev acc in let strList = loop_read [] in let str2sv s = match s with | ":true:" -> BOOL true | ":false:" -> BOOL false | ":error:" -> ERROR | ":unit:" -> UNIT | _-> let rec try_parse_int str = try INT (int_of_string str) with | Failure _ -> try_parse_name str and try_parse_name str= NAME str in try_parse_int s in (* Helper function: file output function. It takes a bool value and write it to the output file. ) let file_write bool_val = Printf.fprintf oc "%s\n" bool_val in letstr2com s = match s with | "Add" -> ADD | "Sub" -> SUB | "Mul" -> MUL | "Div" -> DIV | "Swap" -> SWAP | "Neg" -> NEG | "Rem" -> REM | "ToString" -> TOSTRING | "Println" -> PRINTLN | "Quit" -> QUIT | _ -> PUSH (str2sv s) in let com2str c = match c with | "Add" -> ADD | "Sub" -> SUB | "Mul" -> MUL | "Div" -> DIV | "Swap" -> SWAP | "Neg" -> NEG | "Rem" -> REM | "ToString" -> TOSTRING | "Println" -> PRINTLN | "Quit" -> QUIT | _ -> PUSH (str2sv c) in let sv2str sv = match sv with | BOOL b -> string_of_bool b | INT i -> string_of_int i | ERROR -> ":error:" | STRING s -> s | NAME n -> n in let comList = List.map str2com strList in let stack = ref [] in ( Initialize an empty stack ) letprocessor cl stack = match (cl, stack) with | (ADD::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(a+b)::restOfStack) | (ADD::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (SUB::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(a-b)::restOfStack) | (SUB::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (MUL::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(ab)::restOfStack) | (MUL::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (DIV::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(a/b)::restOfStack) | (DIV::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (REM::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(a%b)::restOfStack) | (REM::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (SWAP::restOfCommands, x::y::restOfStack) -> processor restOfCommands y::x::restOfStack | (SWAP::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (NEG::restOfCommands, INT(a)::restOfStack) -> processor restOfCommands ( INT(-a)::restOfStack) | (NEG::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (TOSTRING::restOfCommands, x::restOfStack) -> processor restOfCommands ( (sv2str x)::restOfStack) | (TOSTRING::restOfCommands, s) -> processor restOfCommands (ERROR::stack) | (PUSH sv::restOfCommands, _) -> processor restOfCommands (sv::stack) | (POP sv::restOfCommands, hd::restOfStack) -> processor restOfCommands restOfStack | (POP sv::restOfCommands, _) -> processor restOfCommands (ERROR::stack) | (PRINTLN::restOfCommands, STRING(a)::restOfStack) -> file_write (a);processor restOfCommands (ERROR::stack) | (PRINTLN::restOfCommands, []) -> processor restOfCommands (ERROR::stack) in processor comList [] Test cases Test cases: input1.txt: push 1 toString println quit

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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Related questions

Concept explainers

Question

interpreter.ml

type command = ADD | SUB | MUL | DIV | PUSH of stackValue | POP | REM | NEG | TOSTRING | SWAP | PRINTLN | QUIT

letinterpreter (input, output) =

let ic = open_in input

let oc = open_out output

letrec loop_read acc =

try

let l = String.trim(input_line ic) in loop_read (l::acc)

with

| End_of_file -> List.rev acc

let strList = loop_read []

let str2sv s =

match s with

| ":true:" -> BOOL true

| ":false:" -> BOOL false

| ":error:" -> ERROR

| ":unit:" -> UNIT

| _->

let rec try_parse_int str =

try

INT (int_of_string str)

with

| Failure _ -> try_parse_name str

and try_parse_name str=

NAME str

try_parse_int s

(* Helper function: file output function. It takes a bool value and

write it to the output file. *)

let file_write bool_val = Printf.fprintf oc "%s\n" bool_val in

letstr2com s =

match s with

| "Add" -> ADD

| "Sub" -> SUB

| "Mul" -> MUL

| "Div" -> DIV

| "Swap" -> SWAP

| "Neg" -> NEG

| "Rem" -> REM

| "ToString" -> TOSTRING

| "Println" -> PRINTLN

| "Quit" -> QUIT

| _ -> PUSH (str2sv s)

let com2str c =

match c with

| "Add" -> ADD

| "Sub" -> SUB

| "Mul" -> MUL

| "Div" -> DIV

| "Swap" -> SWAP

| "Neg" -> NEG

| "Rem" -> REM

| "ToString" -> TOSTRING

| "Println" -> PRINTLN

| "Quit" -> QUIT

| _ -> PUSH (str2sv c)

let sv2str sv =

match sv with

| BOOL b -> string_of_bool b

| INT i -> string_of_int i

| ERROR -> ":error:"

| STRING s -> s

| NAME n -> n

let comList = List.map str2com strList

let stack = ref [] in (* Initialize an empty stack *)

letprocessor cl stack =

match (cl, stack) with

| (ADD::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(a+b)::restOfStack)

| (ADD::restOfCommands, s) -> processor restOfCommands (ERROR::stack)

| (SUB::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(a-b)::restOfStack)

| (SUB::restOfCommands, s) -> processor restOfCommands (ERROR::stack)

| (MUL::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(a*b)::restOfStack)

| (MUL::restOfCommands, s) -> processor restOfCommands (ERROR::stack)

| (DIV::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(a/b)::restOfStack)

| (DIV::restOfCommands, s) -> processor restOfCommands (ERROR::stack)

| (REM::restOfCommands, INT(a)::INT(b)::restOfStack) -> processor restOfCommands ( INT(a%b)::restOfStack)

| (REM::restOfCommands, s) -> processor restOfCommands (ERROR::stack)

| (SWAP::restOfCommands, x::y::restOfStack) -> processor restOfCommands y::x::restOfStack

| (SWAP::restOfCommands, s) -> processor restOfCommands (ERROR::stack)

| (NEG::restOfCommands, INT(a)::restOfStack) -> processor restOfCommands ( INT(-a)::restOfStack)

| (NEG::restOfCommands, s) -> processor restOfCommands (ERROR::stack)

| (TOSTRING::restOfCommands, x::restOfStack) -> processor restOfCommands ( (sv2str x)::restOfStack)

| (TOSTRING::restOfCommands, s) -> processor restOfCommands (ERROR::stack)

| (PUSH sv::restOfCommands, _) -> processor restOfCommands (sv::stack)

| (POP sv::restOfCommands, hd::restOfStack) -> processor restOfCommands restOfStack

| (POP sv::restOfCommands, _) -> processor restOfCommands (ERROR::stack)

| (PRINTLN::restOfCommands, STRING(a)::restOfStack) -> file_write (a);processor restOfCommands (ERROR::stack)

| (PRINTLN::restOfCommands, []) -> processor restOfCommands (ERROR::stack)

in processor comList []

Test cases

Test cases:

input1.txt:

push 1
toString
println
quit

output1.txt:

---

### Understanding OCaml Pattern Matching and Constructor Errors

When working with OCaml, pattern matching is a fundamental concept that helps in deconstructing values and data types. However, developers often encounter warnings and errors related to pattern matching and constructors. Let's examine and understand a typical scenario.

#### Warning: Non-Exhaustive Pattern Matching

**Message:**
```
File "interpreter.ml", line 77, characters 2-142:
Warning 8: this pattern-matching is not exhaustive.
Here is an example of a case that is not matched:
UNIT
```

**Explanation:**
This warning indicates that the pattern matching in your code does not cover all possible cases. Specifically, the case `UNIT` is an example of a value that is not accounted for in your pattern matching blocks. In OCaml, ensuring exhaustive pattern matches is critical to avoid runtime errors.

**Solution:**
To resolve this warning, you should review your pattern-matching code at the specified location (line 77, characters 2-142) and ensure all possible cases are handled. Adding a wildcard pattern (`_`) can help match all remaining cases, but explicit patterns for each case are preferred for clarity and safety.

#### Error: Constructor Argument Mismatch

**Message:**
```
File "interpreter.ml", line 118, characters 5-11:
Error: The constructor POP expects 0 argument(s),
but is applied here to 1 argument(s)
```

**Explanation:**
This error occurs when the constructor `POP` is used incorrectly in your code. According to the type definition, `POP` does not take any arguments. However, your code attempts to pass one argument to it.

**Solution:**
To fix this error, locate the code at line 118, characters 5-11, and correct the application of `POP`. Ensure that `POP` is used without any arguments. For example:
```ocaml
match x with
| POP -> ...
```
instead of:
```ocaml
match x with
| POP(arg) -> ...
```

#### Makefile Error

**Message:**
```
Makefile:3: recipe for target 'all' failed
make: *** [all] Error 2
```

**Explanation:**
This error indicates that the `make` utility encountered an error while executing the `all` target defined in your `Makefile`. The specific error stems from the issues in the

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