Printing 2-dimensional array spirally

This is a discussion on Printing 2-dimensional array spirally within the C Programming forums, part of the General Programming Boards category; Hello, Following code prints the 2-dimensional array spirally. Can anybody have better version or other ideas? Especially in highlighted areas. ...

  1. #1
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    Printing 2-dimensional array spirally

    Hello,

    Following code prints the 2-dimensional array spirally. Can anybody have better version or other ideas? Especially in highlighted areas.

    Currently botton right element prints twice....

    Code:
    # include<stdio.h>
    
    void printElement(int i,int j,int maxCol,int maxRow);
    
    
    int a[4][4] =  {
    				{1,2,3,11},
    				{4,5,6,12},
    				{7,8,9,13},
    				{14,15,16,17},
    				};
    
    void main()
    {
    	int maxCol = sizeof(a[0])/sizeof(a[0][0])-1;
    	int maxRow = sizeof(a)/sizeof(a[0])-1;
    	int i = 0;
    	int j = 0;
    
    	while ( (i < maxRow) && (j < maxCol) )
    	{
    		printElement(i,j,maxCol,maxRow);
    		i++;j++;
    		maxCol--;
    		maxRow--;
    	}
    	if ( (i == maxRow) && (j == maxCol) )
    		printf("%d\t",a[j][i]);
    }
    
    
    
    void printElement(int i,int j,int maxCol,int maxRow)
    {
    	printf("%d\t",a[i][j]);
    
    	if ( j < maxCol )
    	{
    		j++;
    		printElement(i,j,maxCol,maxRow);
    		printf("%d\t",a[j][i]);
    		return;
    	}
    	if ( i < maxRow )
    	{
    		i++;
    //		if ( i == maxRow ) 
    //	                       return;
    		printElement(i,j,maxCol,maxRow);
    		printf("%d\t",a[j][i]);
    		return;
    	}
    	else
    		return;
    }

  2. #2
    ---
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    im not sure what you mean by 'spirally'
    but i compiled this program and i dont really see any pattern at all
    please explain the output your trying to get

  3. #3
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    With above program, it should print

    1,2,3,11,12,13,17,16,15,14,7,4,5,6,9,8

    Let me know, if you can provide better solution....

  4. #4
    ATH0 quzah's Avatar
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    Here's a fun one:
    Code:
    #include <stdio.h>
    #define YSIZE 4
    #define XSIZE 4
    int main( void )
    {
            int yadder = 0, ycoord = 0, yhsize = YSIZE-1, ylsize = 1,
                xadder = 1, xcoord = 0, xhsize = XSIZE-1, xlsize = 0,
                printed = 0;
            int array[YSIZE][XSIZE] =
            {
                    {  1,  2,  3,  4 },
                    { 12, 13, 14,  5 },
                    { 11, 16, 15,  6 },
                    { 10,  9,  8,  7 },
            };
    
            for( printed = 0; printed < YSIZE * XSIZE; printed++, xcoord += xadder, ycoord += yadder )
            {
                    printf("%d ", array[ycoord][xcoord] );
                    if( xadder > 0 && xcoord >= xhsize )
                    {
                            xhsize--;
                            xadder = 0;
                            yadder = 1;
                    }
                    else
                    if( xadder < 0 && xcoord <= xlsize )
                    {
                            xlsize++;
                            xadder = 0;
                            yadder = -1;
                    }
                    else
                    if( yadder > 0 && ycoord >= yhsize )
                    {
                            yhsize--;
                            yadder = 0;
                            xadder = -1;
                    }
                    else
                    if( yadder < 0 && ycoord <= ylsize )
                    {
                            ylsize++;
                            yadder = 0;
                            xadder = 1;
                    }
            }
            return 0;
    }
    I'll let you decide if it's a "better solution".

    [edit]
    Moved initialization from for for the sake of forum width, and other minor width-friendly editing to variable initializations.
    [/edit]

    Quzah.
    Last edited by quzah; 09-22-2004 at 11:51 PM.
    Hope is the first step on the road to disappointment.

  5. #5
    and the hat of wrongness Salem's Avatar
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    > void main()
    I'm sure you said this wasn't going to happen again in some previous post....
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  6. #6
    Obsessed with C chrismiceli's Avatar
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    It was in this post where he said he wouldn't use it anymore.
    Number of set bits
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