Programming Forums > Application Development > C++

OpenLoop · Apr 12th, 2006, 10:36 PM

Ok, i can't answer your question if i don't know what you want.

string cards[decksize] = "Yellow";

Now, this above will set all the elements of cards to "Yellow". So if you print all elements of cards, you'll see "Yellow", "Yellow", "Yellow",...

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string cards[decksize]={"Yellow"};

the above sets the first element of cards to "Yellow", the rest stay uninitialized.

Cache · Apr 12th, 2006, 10:43 PM

Most of your loops are redundant. Such a simple task can be done with a single loop:

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#include <iostream>
#include <string>
#include <vector>

#define MAX_DECK   100

int main( int argc, char *argv[] )
{
	std::vector<std::string> deck( MAX_DECK, "Yellow" );
	unsigned short int red = 0, yellow = MAX_DECK, i = MAX_DECK;
	
	do
	{
		if ( i % 2 == 0 )
		{
			deck[--i] = "Red";
			++red;
		}
	} while ( --i );
	
	yellow -= red;
	
	std::cout << "Yellow: " << yellow << "\nRed: " << red << std::endl;
	std::cin.get();
	return 0;
}

InfoGeek · Apr 13th, 2006, 12:03 AM

Quote:

Originally Posted by OpenLoop

Can you compute the resulting balance of 3,500,000 policies after 6,000,000+ transactions a day?

Sure. But I charge $100,000 /hr for such tasks. :p

*Sorry for posting useless comments*

a3orange · Apr 13th, 2006, 3:22 PM

I think some of you guys are misunderstanding the math problem. He first flips over all the numbers divisible by 2, then he flips over all the ones divisible by 3, then 4, etc..

a3orange · Apr 13th, 2006, 3:57 PM

That's strange, I get different results when I do debug (with break points) then when I compile and run..

Here is my edited code:

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#include <iostream>
#include <string>
using namespace std;
const int decksize = 100;
int main()
{
	string cards[decksize];
    for (int i = 0; i < decksize; i++)
    {
    cards[i] = "Yellow";
}
	int divby;
	int yellow = 100;
    int red = 0;	
	for (divby = 2; divby < decksize; divby++)
	{
        int q;
		for (q = 0; q < decksize; q++)
		{
			if ((cards[q] == "Yellow") && ((q % divby) == 0))
			{
				cards[q] = "Red";
				red++;
				yellow--;
				cout << red << "\t" << yellow << endl;

				
			}
			else if ((cards[q] == "Red")&& ((q % divby) == 0))
			{
				cards[q] == "Yellow";
				cout << red << "\t" << yellow << endl;
				red--;
				yellow++;
				cout << red << "\t" << yellow << endl;
            }
		}
	}
int n;
	for (n = 0; n < decksize; n++)
	{
		if (cards[n] == "Red")
		red++;
		else if (cards[n] == "Yellow")
		yellow++;
	}
cout << "Yellow: " << yellow << endl;
cout << "Red: " << red << endl;
cin.get();
cin.get();
return 0;
}

Thanks to all those who have helped.

a3orange · Apr 13th, 2006, 8:04 PM

I finished my first program!!

I'm so happy:

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#include <iostream>
#include <string>
using namespace std;
int main()
{
	cout << "Please input amount of cards in deck: ";
	int cards;
	cin >> cards;
	string deck[cards];
	
	for (int i = 0; i < cards; i++)
	{
		deck[i] = "Yellow"; // cycle through all cards making them yellow face up
	}
	
	int numbernow;
	int n;
	int yellow = cards;
	int red = 0;
	cout << "Yellow\t\t\tRed";
	
	for (numbernow = 2; numbernow <= cards; numbernow++)
	{
		for (n = 1; n <= cards; n++)
		{
			if (n % numbernow == 0)
			{ 
				if (deck[n-1] == "Yellow")
				{
                                   
					deck[n-1] = "Red";
					red++;
					yellow--;
					cout << endl << yellow << "\t\t\t" << red;
					continue;
				}
				if (deck[n-1] == "Red")
				{
					deck[n-1] = "Yellow";
					yellow++;
					red--;
				    cout << endl << yellow << "\t\t\t" << red;
				    continue;
				}
			}
		}
	}
cout << endl << endl << "Yellow: " << yellow << endl << "Red: " << red;
cin.get();
cin.get();
return 0;
}

OpenLoop · Apr 13th, 2006, 8:06 PM

congrats a3orange. Pretty impressive for a first program.

Apr 12th, 2006, 10:36 PM	#11
OpenLoop Expert Programmer Join Date: May 2005 Location: East Lansing, MI Posts: 663 Rep Power: 4	Ok, i can't answer your question if i don't know what you want. (Toggle Plain Text) string cards[decksize] = "Yellow"; string cards[decksize] = "Yellow"; Now, this above will set all the elements of cards to "Yellow". So if you print all elements of cards, you'll see "Yellow", "Yellow", "Yellow",... (Toggle Plain Text) string cards[decksize]={"Yellow"}; string cards[decksize]={"Yellow"}; the above sets the first element of cards to "Yellow", the rest stay uninitialized.

Apr 12th, 2006, 10:43 PM	#12
Cache Hobbyist Join Date: Sep 2005 Posts: 266 Rep Power: 4	Most of your loops are redundant. Such a simple task can be done with a single loop: (Toggle Plain Text) #include <iostream> #include <string> #include <vector> #define MAX_DECK 100 int main( int argc, char argv[] ) { std::vector<std::string> deck( MAX_DECK, "Yellow" ); unsigned short int red = 0, yellow = MAX_DECK, i = MAX_DECK; do { if ( i % 2 == 0 ) { deck[--i] = "Red"; ++red; } } while ( --i ); yellow -= red; std::cout << "Yellow: " << yellow << "\nRed: " << red << std::endl; std::cin.get(); return 0; } #include <iostream> #include <string> #include <vector> #define MAX_DECK 100 int main( int argc, char argv[] ) { std::vector<std::string> deck( MAX_DECK, "Yellow" ); unsigned short int red = 0, yellow = MAX_DECK, i = MAX_DECK; do { if ( i % 2 == 0 ) { deck[--i] = "Red"; ++red; } } while ( --i ); yellow -= red; std::cout << "Yellow: " << yellow << "\nRed: " << red << std::endl; std::cin.get(); return 0; }

Apr 13th, 2006, 3:57 PM	#15
a3orange Newbie Join Date: Apr 2006 Posts: 14 Rep Power: 0	That's strange, I get different results when I do debug (with break points) then when I compile and run.. Here is my edited code: (Toggle Plain Text) #include <iostream> #include <string> using namespace std; const int decksize = 100; int main() { string cards[decksize]; for (int i = 0; i < decksize; i++) { cards[i] = "Yellow"; } int divby; int yellow = 100; int red = 0; for (divby = 2; divby < decksize; divby++) { int q; for (q = 0; q < decksize; q++) { if ((cards[q] == "Yellow") && ((q % divby) == 0)) { cards[q] = "Red"; red++; yellow--; cout << red << "\t" << yellow << endl; } else if ((cards[q] == "Red")&& ((q % divby) == 0)) { cards[q] == "Yellow"; cout << red << "\t" << yellow << endl; red--; yellow++; cout << red << "\t" << yellow << endl; } } } int n; for (n = 0; n < decksize; n++) { if (cards[n] == "Red") red++; else if (cards[n] == "Yellow") yellow++; } cout << "Yellow: " << yellow << endl; cout << "Red: " << red << endl; cin.get(); cin.get(); return 0; } #include <iostream> #include <string> using namespace std; const int decksize = 100; int main() { string cards[decksize]; for (int i = 0; i < decksize; i++) { cards[i] = "Yellow"; } int divby; int yellow = 100; int red = 0; for (divby = 2; divby < decksize; divby++) { int q; for (q = 0; q < decksize; q++) { if ((cards[q] == "Yellow") && ((q % divby) == 0)) { cards[q] = "Red"; red++; yellow--; cout << red << "\t" << yellow << endl; } else if ((cards[q] == "Red")&& ((q % divby) == 0)) { cards[q] == "Yellow"; cout << red << "\t" << yellow << endl; red--; yellow++; cout << red << "\t" << yellow << endl; } } } int n; for (n = 0; n < decksize; n++) { if (cards[n] == "Red") red++; else if (cards[n] == "Yellow") yellow++; } cout << "Yellow: " << yellow << endl; cout << "Red: " << red << endl; cin.get(); cin.get(); return 0; } Thanks to all those who have helped.

Apr 13th, 2006, 8:04 PM	#16
a3orange Newbie Join Date: Apr 2006 Posts: 14 Rep Power: 0	I finished my first program!! I'm so happy: (Toggle Plain Text) #include <iostream> #include <string> using namespace std; int main() { cout << "Please input amount of cards in deck: "; int cards; cin >> cards; string deck[cards]; for (int i = 0; i < cards; i++) { deck[i] = "Yellow"; // cycle through all cards making them yellow face up } int numbernow; int n; int yellow = cards; int red = 0; cout << "Yellow\t\t\tRed"; for (numbernow = 2; numbernow <= cards; numbernow++) { for (n = 1; n <= cards; n++) { if (n % numbernow == 0) { if (deck[n-1] == "Yellow") { deck[n-1] = "Red"; red++; yellow--; cout << endl << yellow << "\t\t\t" << red; continue; } if (deck[n-1] == "Red") { deck[n-1] = "Yellow"; yellow++; red--; cout << endl << yellow << "\t\t\t" << red; continue; } } } } cout << endl << endl << "Yellow: " << yellow << endl << "Red: " << red; cin.get(); cin.get(); return 0; } #include <iostream> #include <string> using namespace std; int main() { cout << "Please input amount of cards in deck: "; int cards; cin >> cards; string deck[cards]; for (int i = 0; i < cards; i++) { deck[i] = "Yellow"; // cycle through all cards making them yellow face up } int numbernow; int n; int yellow = cards; int red = 0; cout << "Yellow\t\t\tRed"; for (numbernow = 2; numbernow <= cards; numbernow++) { for (n = 1; n <= cards; n++) { if (n % numbernow == 0) { if (deck[n-1] == "Yellow") { deck[n-1] = "Red"; red++; yellow--; cout << endl << yellow << "\t\t\t" << red; continue; } if (deck[n-1] == "Red") { deck[n-1] = "Yellow"; yellow++; red--; cout << endl << yellow << "\t\t\t" << red; continue; } } } } cout << endl << endl << "Yellow: " << yellow << endl << "Red: " << red; cin.get(); cin.get(); return 0; }

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Apr 13th, 2006, 3:22 PM	#14
a3orange Newbie Join Date: Apr 2006 Posts: 14 Rep Power: 0	I think some of you guys are misunderstanding the math problem. He first flips over all the numbers divisible by 2, then he flips over all the ones divisible by 3, then 4, etc..

Apr 13th, 2006, 8:06 PM	#17
OpenLoop Expert Programmer Join Date: May 2005 Location: East Lansing, MI Posts: 663 Rep Power: 4	congrats a3orange. Pretty impressive for a first program.

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