Need help with Collatz Conjecture Loop

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ChristMatt

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Posted: 2nd Apr 2012 20:07

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My friend and I are writing a simple program that lets the user enter a number and the program runs a collatz conjecture on that number and shows each step. For whatever reason, it continues to crash/not run. We don't know if it's the schools crap computers or if there is a problem with our loop/functions. Any input is nice.

+ Code Snippet

// This program solves the collatz conjecture for a number.
// Matthew Yankello and Christian Anderson

#include "DarkGDK.h"

// Prototypes.
void runLoop(int);
void endProgram();

// DarkGDK
void DarkGDK()
{
	// Window title.
	dbSetWindowTitle("Collatz Conjecture.");

	// Receive inputted number.
	dbPrint("This program takes an imputted number from the user");
	dbPrint("and tests it using Collatz Conjecture.");
	dbPrint();
	dbPrint("Please enter a number.");
	int num = atoi(dbInput());
	dbPrint();
	dbPrint("Press any key to initialize test.");
	dbWaitKey();
	dbCLS();

	// Run loop.
	runLoop(num);

	// End program.
	endProgram();
}


void runLoop(int num)
{
	int check;
	while ( num != 1);
	{
		check = num%2;
		if (check = 0)
		{
			num=num/2;
			dbPrint(dbStr(num));
		}
		else
		{
			num=num*3+1;
			dbPrint(dbStr(num));
		}
	}
}

void endProgram()
{
	dbCenterText(dbScreenWidth()/2, dbScreenHeight()/2, "Press any key to end the program.");
	dbWaitKey();
}

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DeadTomGC

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Posted: 3rd Apr 2012 09:04 Edited at: 3rd Apr 2012 09:13

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Hmm, well I would usually put "void" in the argument for endprogram when I am defining and declaring it.

What?! Oh, well that might mean something. atoi takes a str but dbInput is VOID!

OK, so you should have something like this:

+ Code Snippet

int num;
dbPrint("This program takes an imputted number from the user");
	dbPrint("and tests it using Collatz Conjecture.");
	dbPrint("");
	dbPrint("");
	dbInput("Please enter a number.",num);
	dbPrint("");
	dbPrint("Press any key to initialize test.");
	dbWaitKey();

Note that dbInput passes int num by reference, so it will be altered by the function.

Have a look at the documentation on your computer if you haven't already. (C:\Program Files (x86)\The Game Creators\Dark GDK\Documentation).

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ChristMatt

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Posted: 3rd Apr 2012 20:05

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Quote: "
Hmm, well I would usually put "void" in the argument for endprogram when I am defining and declaring it.

What?! Oh, well that might mean something. atoi takes a str but dbInput is VOID!

OK, so you should have something like this:+ Code Snippet
int num;
dbPrint("This program takes an imputted number from the user");
dbPrint("and tests it using Collatz Conjecture.");
dbPrint("");
dbPrint("");
dbInput("Please enter a number.",num);
dbPrint("");
dbPrint("Press any key to initialize test.");
dbWaitKey();

Note that dbInput passes int num by reference, so it will be altered by the function.

Have a look at the documentation on your computer if you haven't already. (C:\Program Files (x86)\The Game Creators\Dark GDK\Documentation).

"

We tried this but are getting errors now from the dbInput because it doesn't take 2 arguements.

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matt yankello

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Posted: 4th Apr 2012 00:48

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Quote: "
Hmm, well I would usually put "void" in the argument for endprogram when I am defining and declaring it.

What?! Oh, well that might mean something. atoi takes a str but dbInput is VOID!

OK, so you should have something like this:+ Code Snippet

Note that dbInput passes int num by reference, so it will be altered by the function.

Have a look at the documentation on your computer if you haven't already. (C:\Program Files (x86)\The Game Creators\Dark GDK\Documentation).
"

Hi I am Christmatt's friend that he is talking about. I do not believe that this is the problem, for I tried running the program with the loop and it worked, well it gave the first number. This leads me to believe that the problem is how I set up the loop.

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DeadTomGC

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Posted: 4th Apr 2012 01:47 Edited at: 4th Apr 2012 01:55

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well, you could always fix num to see if you're loop works.
Then you'll know where the problem is.

The documentation says that dbInput takes 2 arguments. I've never used it though.

Quote: "Syntax
void dbInput ( char* szStatement, int iInput )
"

BTW, did you mean "without" here?

Quote: "for I tried running the program with the loop and it worked,"

One more thing. In general I don't use commands like atoi because I have had bad experiences with them. built in converters are usually built to crash the program if they receive an invalid input. Instead I make my own converter. I could explain how to do this, but it would kind of be a waste of my time if you don't care.

This isn't an issue though for your code since dbInput handles it.

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WickedX

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Posted: 4th Apr 2012 02:08 Edited at: 4th Apr 2012 02:22

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The problem is in the function itself. Try this, it works for me.

// This program solves the collatz conjecture for a number.
// Matthew Yankello and Christian Anderson

#include "DarkGDK.h"

// Prototypes.
int Collatz(int);
void endProgram();

// DarkGDK
void DarkGDK()
{
	int num;

// Window title.
	dbSetWindowTitle("Collatz Conjecture.");

// Receive inputted number.
	dbPrint("This program takes an input number from the user");
	dbPrint("and tests it using Collatz Conjecture.");
	dbPrint();
	dbPrint("Please enter a number.");
	num = atoi(dbInput());
	dbPrint();
	dbPrint("Press any key to initialize test");
	dbWaitKey();
	dbCLS();

// Run loop.
	Collatz(num);

// End program.
	endProgram();
}
int Collatz(int num)
{
    int length = 1; // how many iterations it takes for this number
    while (num != 1)
    {
	// if you want to see the iterations, simply output n here
        if (num % 2 == 0)
	{
            num /= 2;
	    dbPrint((double)num);
        }
	else
	{
            num = (3*num) + 1;
	    dbPrint((double)num);
        }
	length++;
    }
    return length; // returns the number of iterations
}
void endProgram()
{
    dbCenterText(dbScreenWidth()/2, dbScreenHeight()/2, "Press any key to end the program.");
    dbWaitKey();
}

+ Code Snippet

// This program solves the collatz conjecture for a number.
// Matthew Yankello and Christian Anderson

#include "DarkGDK.h"

// Prototypes.
int Collatz(int);
void endProgram();

// DarkGDK
void DarkGDK()
{
	int num;

	// Window title.
	dbSetWindowTitle("Collatz Conjecture.");

	// Receive inputted number.
	dbPrint("This program takes an input number from the user");
	dbPrint("and tests it using Collatz Conjecture.");
	dbPrint();
	dbPrint("Please enter a number.");
	num = atoi(dbInput());
	dbPrint();
	dbPrint("Press any key to initialize test");
	dbWaitKey();
	dbCLS();

	// Run loop.
	Collatz(num);

	// End program.
	endProgram();
}
int Collatz(int num)
{
    int length = 1; // how many iterations it takes for this number
    while (num != 1)
    {
	// if you want to see the iterations, simply output n here
        if (num % 2 == 0)
	{
            num /= 2;
	    dbPrint((double)num);
        }
	else
	{
            num = (3*num) + 1;
	    dbPrint((double)num);
        }
	length++;
    }
    return length; // returns the number of iterations
}
void endProgram()
{
    dbCenterText(dbScreenWidth()/2, dbScreenHeight()/2, "Press any key to end the program.");
    dbWaitKey();
}

Cheers.

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DeadTomGC

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Posted: 4th Apr 2012 02:17 Edited at: 4th Apr 2012 02:23

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Quick question, why are you guys even using the Dark GDK?

Ok, so the guy above this post has code that works.

There is a disconnect between the documentation and the actual Dark GDK apparently when it comes to the dbInput command.

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WickedX

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Posted: 4th Apr 2012 02:32 Edited at: 4th Apr 2012 02:34

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Quote: "
There is a disconnect between the documentation and the actual Dark GDK apparently when it comes to the dbInput command.
"

So what's new? That's why I use IntelliSense.

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ChristMatt

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Posted: 4th Apr 2012 02:37

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Quote: "Quick question, why are you guys even using the Dark GDK?"

We're taking a class that's being taught from the Gaddis book. We got bored, so we tried writing this program. When we hit a wall our teacher couldn't answer any of our questions, and so we came here instead. The end.

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DeadTomGC

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Posted: 4th Apr 2012 03:11

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Well, for the most part the documentation has been accurate as far as I've used it. So, I just learned about that command so its new for me.

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matt yankello

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Posted: 4th Apr 2012 03:54

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Hi thanks for all the input but we actually fixed it by simply changing it to a do-while loop. I am not fully sure why this worked but it did. The reason why we are using darkgdk is because we are actually in high school and we took a c++ class only to learn that the school bought book for gaming and design IN c++ so darkgdk is all we know. And yes I did mean without. Not with

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matt yankello

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Posted: 4th Apr 2012 03:58

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Wicked X thank you very much for your working code as well

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Dark GDK / Need help with Collatz Conjecture Loop