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Giygas learns the art of C++

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Giygas

Posted: Sep 25 2009, 01:54 PM

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Okay, so after a while of trying stuff like

QUOTE

a=b
b=a

I realised that it could work, BUT, b cannot move to a or vice versa because the space is occupied!

So, creating a space without any value, c, I moved a to c. So B moves to A, and then, A(in C) moves to B. Perfect!

QUOTE

#include<iostream>
using namespace std;
int main ()
{
int a=8;
int b=3;
int c;
a=a^b;
b=a^b;
a=a^b;
cout << a;
cout << b;
system("pause");
return 0;
}

Lightning

Posted: Sep 25 2009, 01:56 PM

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a=a^b;
b=a^b;
a=a^b;

pretty sure you copied this from somewhere. it works for integers, granted, but can you explain why?
also, you never use c. the method you explained in english is exactly correct though.

This post has been edited by Lightning on Sep 25 2009, 01:56 PM

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Giygas

Posted: Sep 25 2009, 02:00 PM

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QUOTE (Lightning @ Sep 25 2009, 01:56 PM)

a=a^b;
b=a^b;
a=a^b;

pretty sure you copied this from somewhere. it works for integers, granted, but can you explain why?
also, you never use c

Yeah, I couldn't find the right way to show that A moves to C, for some reason doing
A=C
B=A
C=A
comes up with this large string of numbers :C. I found someone suggesting using "XOR" which I searched up on google, aparently using the ^ symbol.
Does this count as cheating...?
Alas, there is much betters ways for me to find out, of course.

Lightning

Posted: Sep 25 2009, 02:01 PM

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A=C
B=A
C=A

you have them all backwards (and the last one should store C into B).

C=A
A=B
B=C

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Giygas

Posted: Sep 25 2009, 02:03 PM

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QUOTE (Lightning @ Sep 25 2009, 02:01 PM)

A=C
B=A
C=A

you have them all backwards (and the last one should store C into B).

C=A
A=B
B=C

...ahaha... backwards -_-

So I guess my original try was close, just got the positions wrong.
:3

So the final code would be

QUOTE

#include<iostream>
using namespace std;
int main ()
{
int a=8;
int b=3;
int c;
c=a;
a=b;
b=c;
cout << a;
cout << b;
system("pause");
return 0;
}

I feel empowered... :D

This post has been edited by Giygas on Sep 25 2009, 02:04 PM

Giygas	Posted: Sep 25 2009, 02:36 PM
Standard Member Group: Members Posts: 910 Member No.: 4767 Joined: 24-November 07 Status: (0d)	Alright... So I know how to swap variables. I've used it in simple things... So what should I test my knowledge of them with?

RetroXYZ

Posted: Sep 25 2009, 03:05 PM

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QUOTE (Giygas @ Sep 25 2009, 03:36 PM)

Alright...
So I know how to swap variables. I've used it in simple things...
So what should I test my knowledge of them with?

To be honest, I've never found an instance in which I used them myself.

Giygas

Posted: Sep 25 2009, 03:11 PM

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QUOTE (RetroXYZ @ Sep 25 2009, 03:05 PM)

To be honest, I've never found an instance in which I used them myself.

Don't discourage me :C!

Lightning

Posted: Sep 25 2009, 03:35 PM

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use the same logic to swap values around in arrays

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quality web comics (one-shots):

a softer world: truth and beauty bombs
smbc: saturday morning breakfast cereal
buttersafe: pictures and probably some words

Giygas

Posted: Sep 25 2009, 03:41 PM

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QUOTE (Lightning @ Sep 25 2009, 03:35 PM)

use the same logic to swap values around in arrays

Oh ****.
... I'll try :c

Oh right
just switching them int's with arrays

QUOTE

#include<iostream>
using namespace std;
int main ()
{
int thing[2]={1,2};
int c;
c=thing[0];
thing[0]=thing[1];
thing[1]=c;
cout << thing[0];
cout << thing[1];
system("pause");
return 0;
}

This post has been edited by Giygas on Sep 25 2009, 03:47 PM

Giygas	Posted: Sep 25 2009, 04:10 PM
Standard Member Group: Members Posts: 910 Member No.: 4767 Joined: 24-November 07 Status: (0d)	So, now that I have that down... How would I even start to shuffle a full deck? I mean, yes, using the same logic, I could shuffle maybe 10 cards, but that would require alot of variables for empty values to go in! I'm sure there's an easier way, i'm just not thinking hard enough...

RetroXYZ	Posted: Sep 25 2009, 04:38 PM
Standard Member Group: Members Posts: 2714 Member No.: 4325 Joined: 27-August 07 Status: (0d)	You only need one temporary variable to swap. Swap 104 times and it should be well-shuffled.

Kyori	Posted: Sep 25 2009, 04:57 PM
I'm a GUY >.< Group: Members Posts: 1467 Member No.: 6088 Joined: 13-March 09 Status: (0d)	I'm confused, you don't need any extra variables to swap 2 integers. You just do (using A & B): A = A + B B = A - B A = A - B So, A=5 and B=8: A = 5 + 8 (=13) B = 13 - 8 (=5) A = 13 - 5 (=8) A=8, B=5 Or am I missing something with what you're trying to do? :/ --------------------

Giygas

Posted: Sep 25 2009, 04:59 PM

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Woah.

This one took a bit of thinking!
After what Retro said about only needing one temp, I was wondering how I was going to program this to adapt to each card change. Then, of course, it hit me-
Use a variabe that increases by 1 every time a new card is shown!
This way, when it calls up Card[1], the variable will increase by one. So it will call up Card[2] the next time!

Then, of course, is the part where I needed to make it random.
The part
int t=card[i];card[i]=card[e];card[e]=t;
shows me switching the variables using the previously described manor, but how was I going to make I random?
Then it hit me- set a range of the numbers and subtract it by the same number that makes the array go in order.
This way, all of the numbers go in order of the array- But they go at random now!

After all of this, I came up with this:

QUOTE

#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
int card[52];
int e;
int main()
{
srand(time(0));
for(int i=0;i<52;i++)
{
card[i]=i;
}
shuffle:
{
for(int i=0;i<(52-1);i++)
{
int e=i+(rand()%(52-i));
int t=card[i];card[i]=card[e];card[e]=t;
}
for(int c=0;c<52; c++)
{
cout <<card[c]<<", ";
}
cout <<endl;
cout << "\nCard's Shuffled! Shuffle again?\n\n\n";
}
system("pause");
goto shuffle;
return 0;
}

Did I pass :D?

Giygas

Posted: Sep 25 2009, 06:47 PM

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Gonna be expanding upon this for now...

QUOTE

#include<iostream>
using namespace std;

int main ()
{
lol:
int myscore=0;
int mynewcard=0;
int dealerscore=0;
int mytype=1;
srand(time(0));
int game=1;
while (game==1)
{
hit:
cout << "\nDealing cards... Done.\n";
cout << "\nYou have recieved a card with the value of:\n";
mynewcard=(rand()%12)+1;
cout << mynewcard;
myscore=(myscore+mynewcard);
cout << "\nYour hand has a total value of:\n";
cout << myscore;
cout << "\nWhat now?\n1: Hit me\n2: Stand\n";
cin >> mytype;
if (mytype==1)
{
goto hit;
}
if (mytype==2)
{
game=0;
}
}
while (game==0)
{
cout << "\nYou stand with " << myscore << " points.\n";
cout << "\nThe dealer is now playing...\n";
cout << "\nThe dealers turn is over. The dealer has:\n";
dealerscore=(rand()%15)+5;
cout << dealerscore;
cout << "\nPoints... Calculating outcome...\n";
if (dealerscore>21)
{
cout << "\n\n\nDealer busted! You win!\n\n\n";
goto lol;
}
if (myscore>21)
{
cout << "\n\n\nYou busted! You lose!\n\n\n";
goto lol;
}
if (dealerscore>myscore)
{
cout << "\n\n\nThe dealer has more points. The dealer wins.\n\n\n";
goto lol;
}
if (myscore>dealerscore)
{
cout << "\n\n\nYou have more points. You win!\n\n\n";
goto lol;
}
if (myscore==dealerscore)
{
cout << "\n\n\nIt's a tie.\n\n\n";
goto lol;
}
system("pause");
return 0;
}
}

I'm BlackJack. Hi.

Giygas	Posted: Sep 27 2009, 04:08 PM
Standard Member Group: Members Posts: 910 Member No.: 4767 Joined: 24-November 07 Status: (0d)	Think i'm going to let off the arrays, and move onto uh Whatever comes next!~ checks Character Sequences. Hmm. Looks good :3

Xgoff

Posted: Sep 27 2009, 04:17 PM

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QUOTE (Giygas @ Sep 27 2009, 03:08 PM)

Think i'm going to let off the arrays, and move onto uh
Whatever comes next!~
*checks*
Character Sequences. Hmm. Looks good :3

character sequences are arrays

unless i'm thinking of something totally different

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Giygas

Posted: Sep 27 2009, 04:20 PM

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QUOTE (Xgoff @ Sep 27 2009, 04:17 PM)

character sequences are arrays

unless i'm thinking of something totally different

Oh hey, they are.
... *reads*

Yeah, just arrays that store data that you can input. Like names.
:3

Then I guess I go onto...
Pointers D:!

edit: holy **** thats alot to read about pointers :c

This post has been edited by Giygas on Sep 27 2009, 04:20 PM

Baroque

Posted: Sep 27 2009, 04:37 PM

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pointers should not take so long to explain it is why i never got it

pointers store memory addresses instead of values

meaning instead of copying an entire twelve-page essay into the clipboard, you would copy a pointer into the clipboard where the essay starts and then go

RETRIEVE_WHATEVER_IS_IN_THIS_MEMORY_ADDRESS(pointer);

which is incredibly more efficient

(just have to hope the essay's data is contiguous. i guess it won't be?)

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two is used when your talking about places and locations

Giygas

Posted: Sep 27 2009, 04:42 PM

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QUOTE (Baroque @ Sep 27 2009, 04:37 PM)

Yeah, aparently, it's very useful.
I've already written a very, very small thing ( I always try to figure out the most basic operation before lookng at the example code ), although it appeared to be complicated at first, it's not :D

QUOTE

#include<iostream>
using namespace std;

int main ()
{
int strength=5;
int *tommy = &strength;
cout << *tommy;
system("pause");
return 0;
}

It's just like saying that a=b, only instead of using b's value, it uses it's reference.

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