Greetings Ruby fans
From a couple of months I've been learning C++ but after I found out
about Ruby... it's just GREAT!
Right now im at a beginner level, trying to convert some simplier code
to Ruby (it's easier for me to learn this way)
Can somebody please me a little? ;>
Ofcourse a working example would be also nice

BTW sorry for my English...

//---------------------------------------------------------------------------
#include<math.h> //WHAT TO DO WITH THOSE
#include<iostream>
#include<cstdio>

//---------------------------------------------------------------------------
#pragma argsused
using namespace std;
class Drink{
double price;
char name[20];
int amount,bought;
public:
Drink(double cen, int how_much, char* nn) {
price=cen;
amount=how_much;
strcpy(name,nn);
bought=0;
};
double change(double x){
amount--; //HOW TO DO THIS
bought++;
return x-price;
};
int amounti() {return amount;};
double pricea(){return price;};
int buy(){return bought;};
bool canbuy(){
if (amount==0)
return false;
else return true;
};
void namea(){cout<<name;};
friend class Automat; //WHAT TO DO WIGHT THIS
};
class Automat{
private:
double tab[2][8],u,w,x;
public:
Automat(double pie,double dwa,double jed,double piec,double
dwad,double dzi)
{
tab[0][0]=pie;
tab[0][1]=dwa;
tab[0][2]=jed;
tab[0][3]=piec;
tab[0][4]=dwad;
tab[0][5]=dzi;
tab[1][0]=5;
tab[1][1]=2;
tab[1][2]=1;
tab[1][3]=0.5;
tab[1][4]=0.2;
tab[1][5]=0.1;
};
void Coinsy(Drink *n,double s,int g){
x=s-n[g].price;
for (int i = 0; i <=5; i++) {
w=tab[0][i];
for (double j =w; j>0; j--) {
if ((x-tab[1][i])> -0.0001) {
tab[0][i]--;
x=x-tab[1][i];
cout<<tab[1][i]<<endl;
}
}
}
};
void write(){
cout<<"Coins 5zl: "<<tab[0][0]<<endl;
cout<<"Coins 2zl: "<<tab[0][1]<<endl;
cout<<"Coins 1zl: "<<tab[0][2]<<endl;
cout<<"Coins 50gr: "<<tab[0][3]<<endl;
cout<<"Coins 20gr: "<<tab[0][4]<<endl;
cout<<"Coins 10gr: "<<tab[0][5]<<endl;
};
void add(double x){
if (x==5) tab[0][0]++;
if (x==2) tab[0][1]++;
if (x==1) tab[0][2]++;
if (x==0.5)tab[0][3]++;
if (x==0.2)tab[0][4]++;
if (x==0.1)tab[0][5]++;
}
};

int main()
{
int q=1,y,i,g;
double m=1,s=0;
Automat p(15,15,20,25,25,25);
Drink Drinke[3]= {
Drink(1.7,0,"Coca-Cola"),
Drink(2,0,"Sprite"),
Drink(2.1,20,"Fanta")
};

while(q!=0)
{
cout<<"What would you like to do?"<<endl;
cout<<"Kupic Drink: press 1"<<endl;
cout<<"Print Coins report: press 2"<<endl;
cout<<"Print bought Drinks report: press 3"<<endl;
cout<<"Exit: press 0"<<endl;
cin>>q;
switch (q) //I'M NOT QUITE SURE HOW TO USE SWITCH IN RUBY
{
case 1: {
system("cls");
for (int j = 0; j <3; j++) {
Drinke[j].namea();
cout<<": "<<Drinke[j].pricea()<<" nacisnij "<<j<<endl;
}
cin>>g;
if (Drinke[g].canbuy()) {
y=1;
s=0;
while (y!=0){
cout<<"Coins Input: "<<s<<endl<<" What to do: \n\t\t
Input Coins: 0 \n\t\t Buy Drink: 1 \n\t\t Cancel: 2"<<endl;
cout<<"Your choice: ";
cin>>y;
if (y==0) {
cout<<"Input Coins. ";
cin>>m;
s+=m;
p.add(m);
}
if ((y==1)&&(Drinke[g].change(s)<0)) {cout<<"No cash. Input
Coins."<<endl;}
else {
cout<<"change: "<<endl;
p.Coinsy(Drinke,s,g);
}
if (y==2) { break; }
}
}
else cout<<"No such drink."<<endl;
}
case 2:
p.write();
case 3: {
system("cls"); //CAN YOU CLEAR SCREEN IN RUBY?
cout<<"Drinks bought: "<<endl;
for (int i=0; i <3; i++) {
Drinke[i].namea();
cout<<": "<<Drinke[i].buy()<<endl;
}
cout<<endl;
break;
}
}
}
getchar(); getchar();
return 0;
}
//---------------------------------------------------------------------------
--
Posted via http://www.ruby-forum.com/.

On Mon, Jun 9, 2008 at 2:40 PM, Jed Kowalski <satanowicz@gmail.com> wrote:
> Greetings Ruby fans
> From a couple of months I've been learning C++ but after I found out
> about Ruby... it's just GREAT!
> Right now im at a beginner level, trying to convert some simplier code
> to Ruby (it's easier for me to learn this way)
> Can somebody please me a little? ;>
> Ofcourse a working example would be also nice

You might have better luck asking for with specific sections of
code, rather than asking us to rewrite a whole program. Try doing a
best-guest translation to Ruby on your own, and asking about the parts
you have trouble with.

--
Avdi

Home: http://avdi.org
Developer Blog: http://avdi.org/devblog/
Twitter: http://twitter.com/avdi
Journal: http://avdi.livejournal.com

Avdi Grimm wrote:
> You might have better luck asking for with specific sections of
> code, rather than asking us to rewrite a whole program. Try doing a
> best-guest translation to Ruby on your own, and asking about the parts
> you have trouble with.

ok so, here's the first problem:
def initialize (cen, ile, nn)
@price=cen
@amount=ile
@name=nn
@bought=0
end


def change(x)
amount--
bought++
return x-price //WHATS WRONG HERE?
end

and I get:

gut.rb:13: void value expression
return x-cena
^
gut.rb:13: syntax error, unexpected tIDENTIFIER, expecting kEND
return x-cena

--
Posted via http://www.ruby-forum.com/.

Jed Kowalski wrote:
> def change(x)
> amount--
> bought++
> return x-price //WHATS WRONG HERE?
> end
>
> and I get:
>
> gut.rb:13: void value expression
> return x-cena


I think a google search for "Instance Variables" should enlighten you

Jed Kowalski wrote:
> Avdi Grimm wrote:
>> You might have better luck asking for with specific sections of
>> code, rather than asking us to rewrite a whole program. Try doing a
>> best-guest translation to Ruby on your own, and asking about the parts
>> you have trouble with.
>
> ok so, here's the first problem:
> def initialize (cen, ile, nn)
> @price=cen
> @amount=ile
> @name=nn
> @bought=0
> end
>
>
> def change(x)
> amount--
> bought++
> return x-price //WHATS WRONG HERE?
> end
>
> and I get:
>
> gut.rb:13: void value expression
> return x-cena
> ^
> gut.rb:13: syntax error, unexpected tIDENTIFIER, expecting kEND
> return x-cena
>

Well, if you want to refer to the @amount, @bought, and @price instance
variables in the change() method you have to use the correct names. Also
Ruby doesn't have the -- and ++ methods.

def change(x)
@amount -= 1
@bought += 1
return x - @price
end





--
RMagick: http://rmagick.rubyforge.org/
RMagick 2: http://rmagick.rubyforge.org/rmagick2.html

-------- Original-Nachricht --------
> Datum: Tue, 10 Jun 2008 05:38:30 +0900
> Von: Jed Kowalski <satanowicz@gmail.com>
> An: ruby-talk@ruby-lang.org
> Betreff: Re: C++ 2 Ruby

> Avdi Grimm wrote:
> > You might have better luck asking for with specific sections of
> > code, rather than asking us to rewrite a whole program. Try doing a
> > best-guest translation to Ruby on your own, and asking about the parts
> > you have trouble with.
>
> ok so, here's the first problem:
> def initialize (cen, ile, nn)
> @price=cen
> @amount=ile
> @name=nn
> @bought=0
> end
>
>
> def change(x)
> amount--
> bought++
> return x-price //WHATS WRONG HERE?
> end
>
> and I get:
>
> gut.rb:13: void value expression
> return x-cena
> ^
> gut.rb:13: syntax error, unexpected tIDENTIFIER, expecting kEND
> return x-cena
>
> --
> Posted via http://www.ruby-forum.com/.

Jed, you could do this:

class MyClass # my most creative invention of a class name
attr_accessor :price,:amount,:name,:bought # creates ways to get/set @price,@amount,... from MyClass

def initialize (cen, ile, nn)
@price=cen
@amount=ile
@name=nn
@bought=0
end
def change(x)
@amount-=1
@bought+=1
x-self.price
end
end

cen=500
ile=400
nn=4
obj=MyClass.new(cen,ile,nn)
p obj.change(1) # -499 =1-500

Read about accessors here: http://www.ruby-doc.org/docs/UsersGu...accessors.html

Best regards,

Axel
--
Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen!
Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer

Axel Etzold wrote:
> Jed, you could do this:
>
> class MyClass # my most creative invention of a class name
> attr_accessor :price,:amount,:name,:bought # creates ways to get/set
> @price,@amount,... from MyClass
>
> def initialize (cen, ile, nn)
> @price=cen
> @amount=ile
> @name=nn
> @bought=0
> end
> def change(x)
> @amount-=1
> @bought+=1
> x-self.price
> end
> end
>
> cen=500
> ile=400
> nn=4
> obj=MyClass.new(cen,ile,nn)
> p obj.change(1) # -499 =1-500
>
> Read about accessors here:
> http://www.ruby-doc.org/docs/UsersGu...accessors.html
>
> Best regards,
>
> Axel

ufff... almoust done...
I can compile the code but it doesn't want to work, juz like the
variable q isn't seen properly, something with the 'case' instruction
maybe?
(BTW sorry for Polish texts)

class Napoj

def initialize (cen, ile, nn)
@cena=cen
@ilosc=ile
@nazwa=nn
@kupione=0
end

def wydajreszte(x)
@ilosc-=1
@kupione+=1
return x-cena
end
def ilosci() return ilosc end
def cenaa() return cena end
def kupno() return kupione end
def czyjest()
if ilosc==0 then
return false
else return true
end
end
def nazwaa() puts nazwa end

end
class Automat

def initialize (pie, dwa, jed, piec, dwad, dzi)
@tab = [[pie, dwa, jed, piec, dwad, dzi],[5,2,1,0.5,0.2,0.1]]
end
def monety(n, s, g)
x=s-n[g].cena
for i in 1.. 5
w=tab[0][i]
for w in w..0
if (x-tab[1][i])> -0.0001 then
tab[0][i]-=1
x=x-tab[1][i]
puts tab[1][i]
end
end
end
end
def wypisz()
puts "Monet 5zl: ", tab[0][0]
puts "Monet 2zl: ", tab[0][1]
puts "Monet 1zl: ", tab[0][2]
puts "Monet 50gr: ", tab[0][3]
puts "Monet 20gr: ", tab[0][4]
puts "Monet 10gr: ", tab[0][5]
end
def dodaj(x)
if x==5 then tab[0][0]+=1 end
if x==2 then tab[0][1]+=1 end
if x==1 then tab[0][2]+=1 end
if x==0.5 then tab[0][3]+=1 end
if x==0.2 then tab[0][4]+=1 end
if x==0.1 then tab[0][5]+=1 end
end
end


q=1
m=1
s=0
p = Automat.new(15,15,20,25,25,25)
napoje = [
Napoj.new(1.7,0,"Coca-Cola"),
Napoj.new(2,0,"Sprite"),
Napoj.new(2.1,20,"Fanta") ]


while q!=0
puts "Co chcesz zrobic?"
puts "Kupic napoj: nacisnij 1"
puts "Wydrukowac raport o monetach: nacisnij 2"
puts "Wydrukowac raport o kupionych napojach: nacisnij 3"
puts "Wyjsc: nacisnij 0"

q = gets
puts q

case q

when 1

for j in 0..2
napoje[j].nazwaa()
puts ": "+napoje[j].cenaa()+" nacisnij "+j
end
g = gets
if napoje[g].czyjest() then
y=1
s=0
while y!=0
puts "Monety wrzucne: "+s+" Co chcesz zrobic: \n\t\t
Wrzuc monete: 0 \n\t\t Kup napoj: 1 \n\t\t Anuluj: 2"
puts "Twoj wybor: "
y = gets
if y==0 then
puts "Wrzuc monete. "
m = gets
s+=m
p.dodaj(m)
end
if y==1 && napoje[g].wydajreszte(s)<0 then puts "Brak srodkow.
Wrzuc monete."
else
puts "reszta: "
p.monety(napoje,s,g)
end
if y==2 then break end
end


else puts "Brak zadanego napoju."
end
when 2
p.wypisz()
when 3
puts "Kupiles: "
for i in 0..2
napoje[i].nazwaa()
puts ": ", napoje[i].kupno()
end
end
end
--
Posted via http://www.ruby-forum.com/.

-------- Original-Nachricht --------
> Datum: Tue, 10 Jun 2008 07:53:25 +0900
> Von: Jed Kowalski <satanowicz@gmail.com>
> An: ruby-talk@ruby-lang.org
> Betreff: Re: C++ 2 Ruby

> Axel Etzold wrote:
> > Jed, you could do this:
> >
> > class MyClass # my most creative invention of a class name
> > attr_accessor :price,:amount,:name,:bought # creates ways to get/set
> > @price,@amount,... from MyClass
> >
> > def initialize (cen, ile, nn)
> > @price=cen
> > @amount=ile
> > @name=nn
> > @bought=0
> > end
> > def change(x)
> > @amount-=1
> > @bought+=1
> > x-self.price
> > end
> > end
> >
> > cen=500
> > ile=400
> > nn=4
> > obj=MyClass.new(cen,ile,nn)
> > p obj.change(1) # -499 =1-500
> >
> > Read about accessors here:
> > http://www.ruby-doc.org/docs/UsersGu...accessors.html
> >
> > Best regards,
> >
> > Axel
>
> ufff... almoust done...
> I can compile the code but it doesn't want to work, juz like the
> variable q isn't seen properly, something with the 'case' instruction
> maybe?
> (BTW sorry for Polish texts)
>
> class Napoj
>
> def initialize (cen, ile, nn)
> @cena=cen
> @ilosc=ile
> @nazwa=nn
> @kupione=0
> end
>
> def wydajreszte(x)
> @ilosc-=1
> @kupione+=1
> return x-cena
> end
> def ilosci() return ilosc end
> def cenaa() return cena end
> def kupno() return kupione end
> def czyjest()
> if ilosc==0 then
> return false
> else return true
> end
> end
> def nazwaa() puts nazwa end
>
> end
> class Automat
>
> def initialize (pie, dwa, jed, piec, dwad, dzi)
> @tab = [[pie, dwa, jed, piec, dwad, dzi],[5,2,1,0.5,0.2,0.1]]
> end
> def monety(n, s, g)
> x=s-n[g].cena
> for i in 1.. 5
> w=tab[0][i]
> for w in w..0
> if (x-tab[1][i])> -0.0001 then
> tab[0][i]-=1
> x=x-tab[1][i]
> puts tab[1][i]
> end
> end
> end
> end
> def wypisz()
> puts "Monet 5zl: ", tab[0][0]
> puts "Monet 2zl: ", tab[0][1]
> puts "Monet 1zl: ", tab[0][2]
> puts "Monet 50gr: ", tab[0][3]
> puts "Monet 20gr: ", tab[0][4]
> puts "Monet 10gr: ", tab[0][5]
> end
> def dodaj(x)
> if x==5 then tab[0][0]+=1 end
> if x==2 then tab[0][1]+=1 end
> if x==1 then tab[0][2]+=1 end
> if x==0.5 then tab[0][3]+=1 end
> if x==0.2 then tab[0][4]+=1 end
> if x==0.1 then tab[0][5]+=1 end
> end
> end
>
>
> q=1
> m=1
> s=0
> p = Automat.new(15,15,20,25,25,25)
> napoje = [
> Napoj.new(1.7,0,"Coca-Cola"),
> Napoj.new(2,0,"Sprite"),
> Napoj.new(2.1,20,"Fanta") ]
>
>
> while q!=0
> puts "Co chcesz zrobic?"
> puts "Kupic napoj: nacisnij 1"
> puts "Wydrukowac raport o monetach: nacisnij 2"
> puts "Wydrukowac raport o kupionych napojach: nacisnij 3"
> puts "Wyjsc: nacisnij 0"
>
> q = gets
> puts q
>
> case q
>
> when 1
>
> for j in 0..2
> napoje[j].nazwaa()
> puts ": "+napoje[j].cenaa()+" nacisnij "+j
> end
> g = gets
> if napoje[g].czyjest() then
> y=1
> s=0
> while y!=0
> puts "Monety wrzucne: "+s+" Co chcesz zrobic: \n\t\t
> Wrzuc monete: 0 \n\t\t Kup napoj: 1 \n\t\t Anuluj: 2"
> puts "Twoj wybor: "
> y = gets
> if y==0 then
> puts "Wrzuc monete. "
> m = gets
> s+=m
> p.dodaj(m)
> end
> if y==1 && napoje[g].wydajreszte(s)<0 then puts "Brak srodkow.
> Wrzuc monete."
> else
> puts "reszta: "
> p.monety(napoje,s,g)
> end
> if y==2 then break end
> end
>
>
> else puts "Brak zadanego napoju."
> end
> when 2
> p.wypisz()
> when 3
> puts "Kupiles: "
> for i in 0..2
> napoje[i].nazwaa()
> puts ": ", napoje[i].kupno()
> end
> end
> end
> --
> Posted via http://www.ruby-forum.com/.

Jed,

if you ask for a variable using 'gets', this gives you a String.
So you have to write

mystring=gets
case mystring
when '1' # instead of when 1
# ....

I would love to be able to speak Polish ... it's amazing that people who can still ask questions
about anything

Best regards,

Axel

--
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