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Hexagon not printing out right

Aalnius (31)
Hey guys so i finished my program and i decided to try to improve a few flaws it has, one of which is that when using an odd number my vertical lines match up but not when using an even number.

So i was wondering if someone could point out where im going wrong,
heres my function it works fine other then the alignment problem.

i tried to sort it by checking if the size inputted is odd or even then printing out the lines accordingly, but that dosn't seem to work.

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void Vertical(int sizeInput, int type)
	{
		//spacer stores spaces to be used to properly space hexagons and add gaps inside them
		//counter stores number of iterations that have currently passed so inside spaces get placed properly
		string spacer = " ";
		int counter =0;
		fill = "|";
		cout << "Type " << type << endl;
		int rows = 0;
		for(; rows < size+1;rows++)
		{
			if(rows==0)
			{
				for(int spaces = 1+size; spaces > rows;spaces--)
				{
					cout << spacer;
				}
				for(int tops = 0; tops < size;tops++)
				{
					cout << "_";
				}
				cout << endl;
			}
		else
		{
				for(int spaces = 1+size;spaces > rows;spaces--)
				{
					cout << spacer;
				}
				cout << "/";
				for(int stars=0; stars < size + ((rows - 1) * 2);stars++)
				{
					//checks if current iteration is even and if type is 4 
					//if so prints a spacer instead of the filler
					if(size % 2 == 0)
					{
						if(counter % 2 == 0)
						{
							cout << spacer;
							counter++;
						}
						else
						{
							cout << fill;
							counter++;
						}
					}
					if(size % 2 != 0)
					{
						if(counter % 2 == 0)
						{
							cout << fill;
							counter++;
						}
						else
						{
							cout << spacer;
							counter++;
						}
					}
				}
				cout << "\\";
				cout << endl;
		}
		}
		//empties counter value so iteration count is reset
		counter = 0;
		for(; rows >= 2; rows--)
		{		
			if(rows == 2)
			{
				for(int spaces = 2+size;spaces > rows;spaces--)
				{
					cout << spacer;
				}
				cout << "\\";
				for(int bottoms = 0;bottoms < size;bottoms++)
				{
					cout << "_";
				}
				cout << "/";
				cout << endl;
			}
			else
			{
				for(int spaces = 2+size;spaces > rows;spaces--)
				{
					cout << spacer;
				}
				cout << "\\";
				if(size % 2 == 0)
				{
					for(int stars=0; stars < size + ((rows - 2) *2);stars++)
					{
						if(counter % 2 == 0)
						{
							cout << spacer;
							counter++;
						}
						else
						{
							cout << fill;
							counter++;
						}
					}
				}
				if(size % 2 != 0)
				{
					for(int stars=0; stars < size + ((rows - 2) *2);stars++)
					{
						if(counter % 2 == 0)
						{
							cout << fill;
							counter++;
						}
						else
						{
							cout << spacer;
							counter++;
						}
					}
				}
				cout << "/";
				cout << endl;
			}
		}
		rows =0;
		counter = 0;
		}


thanks in advance, also this is my assignment but i've done the actual assignment now im just finetuning it.
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