Add to_string methods to both classes that display information about the object by invoking the appropriate methods and variables. 1# (new horse 101 "Comet") #to_string ;; 2 string = "I am a horse, my name is Comet and I weigh 101 kilograms. My father is a horse and my mother is a horse." 3# (new donkey 102 "Donner") #to_string ;; 4-string = "I am a donkey, my name is Donner and I weigh 102 kilograms. My father is a donkey and my mother is a donkey." Create classes hinny and mule with same signatures as horse and donkey. However their to_string methods should display as shown below. 1# (new hinny 103 "Vixen") #species ;; 2 string = "hinny" # (new hinny 103 "Vixen") #to_string ;; 4-string = s "I am a hinny, my name is Vixen and I weigh 103 kilograms. My father is a horse and my mother is a donkey." #(new mule 104 "Prancer") #species ;; : string = "mule" s # (new mule 104 "Prancer") #to_string ;; string = o "I am a mule, my name is Prancer and I weigh 104 kilograms. My father is a donkey and my mother is a horse." Note that whenever a word among "horse"," donkey","hinny" or "mule" is dis- played you are supposed to invoke the appropriate methods.

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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Do this exercise in oCaml

2 Mules and Hinnies
We are given the classes donkey and horse.
1 class donkey w s=object (self)
2 val weight =(w:int)
3 val name = (s: string)
4 method species="donkey"
s end; ;
6
7 class horse w s=object (self)
8 val weight =(w:int)
9 val name = (s:string)
10 method species="horse"
11 end; ;
Transcribed Image Text:2 Mules and Hinnies We are given the classes donkey and horse. 1 class donkey w s=object (self) 2 val weight =(w:int) 3 val name = (s: string) 4 method species="donkey" s end; ; 6 7 class horse w s=object (self) 8 val weight =(w:int) 9 val name = (s:string) 10 method species="horse" 11 end; ;
Add to_string methods to both classes that display information about the
object by invoking the appropriate methods and variables.
# (new horse 101 "Comet ") #to_string ;;
1
2
string = "I am a horse, my name is Comet and I
4
# (new donkey 102 "Donner") #to_string ;;
-: string = "I am a donkey, my name is Donner and I
weigh 102 kilograms. My father is a donkey and my
mother is a donkey."
weigh 101 kilograms. My father is a horse and my
mother is a horse."
Create classes hinny and mule with same signatures as horse and donkey.
However their to_string methods should display as shown below.
1 # (new hinny 103 "Vixen") #species ;;
2
-
: string "hinny"
3
# (new hinny 103 "Vixen") #to_string ;;
-
4 -: string
5 "I am a hinny, my name is Vixen and I weigh 103
kilograms. My father is a horse and my mother is a
donkey. "
6 # (new mule 104 "Prancer") #species ;;
= "mule"
=
: string
8 # (new mule 104 "Prancer") #to_string ;;
9 -
string =
10 "I am a mule, my name is Prancer and I weigh 104
kilograms. My father is a donkey and my mother is a
horse. "
Note that whenever a word among "horse","donkey","hinny" or "mule" is dis-
played you are supposed to invoke the appropriate methods.
Transcribed Image Text:Add to_string methods to both classes that display information about the object by invoking the appropriate methods and variables. # (new horse 101 "Comet ") #to_string ;; 1 2 string = "I am a horse, my name is Comet and I 4 # (new donkey 102 "Donner") #to_string ;; -: string = "I am a donkey, my name is Donner and I weigh 102 kilograms. My father is a donkey and my mother is a donkey." weigh 101 kilograms. My father is a horse and my mother is a horse." Create classes hinny and mule with same signatures as horse and donkey. However their to_string methods should display as shown below. 1 # (new hinny 103 "Vixen") #species ;; 2 - : string "hinny" 3 # (new hinny 103 "Vixen") #to_string ;; - 4 -: string 5 "I am a hinny, my name is Vixen and I weigh 103 kilograms. My father is a horse and my mother is a donkey. " 6 # (new mule 104 "Prancer") #species ;; = "mule" = : string 8 # (new mule 104 "Prancer") #to_string ;; 9 - string = 10 "I am a mule, my name is Prancer and I weigh 104 kilograms. My father is a donkey and my mother is a horse. " Note that whenever a word among "horse","donkey","hinny" or "mule" is dis- played you are supposed to invoke the appropriate methods.
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