Star Patterns

new programer · #1 21-Oct-2009, 04:21

Hello all,

I have a problem in printing a certain patteren "as showed in the attachments.

Here is my tries so far

CPP / C++ / C Code:

# include <iostream>
using namespace std;

int main ()
{ 

	// Part a

	for (int i=1; i<=5; i++)
	{ 
		for (int h=1; h<=i; h++)
			cout << "*";
		    cout << endl;
	}
cout << endl;

    // Part b

   for (int i=5; i>=1; i--)
	{ 
		for (int h=5; h>=i; h--)
			cout << "*";
		    cout << endl;
	}


   return 0;

}

Please help

DRACO2032 · #2 21-Oct-2009, 14:03

I think it would be a good ideas for you to do this:

CPP / C++ / C Code:

# include <iostream>
using namespace std;

int main ()
{ 

	// Part a

	for (int i=1; i<=5; i++)
	{ 
		for (int h=1; h<=i; h++)
			cout << "*"<<endl;
		    cout << endl;
	}
cout << endl;

    // Part b

   for (int i=5; i>=1; i--)
	{ 
		for (int h=5; h>=i; h--)
			cout << "*"endl;
		    cout << endl;
	}


   return 0;

}

I mean if you are trying to get a pattern. Try it other wise fo rthe best of my little knowledge (x_x)

new programer · #3 21-Oct-2009, 18:29

Now it does not make the shapes I wanted

... at first it did but it did two identical ones although the conditions are different

it's a tricky code for a begginer lol

any help and remarks to achieve the output attached would be highly appreciated

Kimmo · #4 22-Oct-2009, 02:12

Quote:

Originally Posted by new programer

... at first it did but it did two identical ones although the conditions are different

I don't actually see any attachments that would show what kind of shape you're trying to produce. So perhaps you should include the shape in your next post?

As for the conditions being different and the shape being same... Look at the code you have in your loops. It's identical in both. How could it possibly produce anything but identical results?

new programer · #5 24-Oct-2009, 01:14

Oh I'm sorry

It must have slipped off the attachments

Please look into the attached file --to this post--

Kimmo · #6 24-Oct-2009, 06:54

It's pretty simple. Effectively you have to play around with printing spaces and printing stars. For example, in the shape you already managed to print, you first print one star and 4 spaces, then 2 stars and 3 spaces, then 3 stars and 2 spaces etc. Or to put it another way, on the first iteration (the first run through your outer for loop) you print 1 star, on the second you print 2 stars etc. Or to put it yet another way... If the current iteration number of the inner loop is smaller or equal to the current iteration number of the outer loop, print a star.

So, as an example, let's say the outer loop iteration number is 4. You enter the inner loop, the iteration number is 1. 1 <= 4 is true, so you print a star. Once the inner loop number goes to 5, you print a space which is exactly as it should be, since the outer loop number represents also the line number you're at.

Still following? As an example, here are the first two shapes based on this logic.

CPP / C++ / C Code:

#include <iostream>

using std::cout;
using std::endl;

int main()
{
    for (int i = 1; i <= 5; i++)
    {
        for (int j = 1; j <= 5; j++)
        {
            if (j <= i)
                cout << '*';
            else
                cout << ' ';
        }
        cout << endl;
    }
    
    cout << "\n\n";
    
    for (int i = 5; i >= 1; i--)
    {
        for (int j = 1; j <= 5; j++)
        {
            if (j <= i)
                cout << '*';
            else
                cout << ' ';
        }
        cout << endl;
    }
    
    return 0;
}

The last two shapes should be pretty easy once you understand it.

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Star Patterns

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