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  1. #include <stdio.h>
  2.  
  3. void spiral(int n,int m,int arr[][m])
  4. {
  5. 	int top = 0,			
  6. 		right = m - 1,		
  7. 		bottom = n - 1,		
  8. 		left = 0, 
  9. 		k;  
  10.  
  11. 	while( top <= bottom  &&  left <= right )
  12. 	{
  13. 		//print top row
  14. 		for ( k = left; k <= right; k++ )
  15. 		{
  16. 			printf("%d  ",arr[top][k]);
  17. 		}
  18. 		++top;
  19.  
  20. 		//print right column
  21. 		for( k = top; k <= bottom; k++ )
  22. 		{
  23. 			printf("%d   ",arr[k][right]);
  24. 		}
  25. 		--right;
  26.  
  27. 		//print bottom row
  28. 		for( k = right; k >= left; k-- )
  29. 		{
  30. 			printf("%d   ",arr[bottom][k]);
  31. 		}
  32. 		--bottom;
  33.  
  34. 		//print left column
  35. 		for( k = bottom; k >= top; k-- )
  36. 		// this was wrong ^^^^^^ in OP's code
  37. 		{
  38. 			printf("%d   ",arr[k][left]);
  39. 		}
  40. 		++left;
  41. 	}
  42. }
  43.  
  44. int main(void) {
  45. 	int rows = 4, cols = 5;
  46. 	int board[rows][cols];
  47.  
  48. 	printf("Original:\n");
  49. 	for ( int i = 0; i < rows; ++i ) {
  50. 		for ( int j = 0; j < cols; ++j ) {
  51. 			board[i][j] = 1 + i*cols + j;
  52. 			printf("%d ", board[i][j]);
  53. 		}
  54. 		printf("\n");
  55. 	}
  56. 	printf("\nSpiral printing:\n");
  57. 	spiral(rows,cols,board);
  58. 	return 0;
  59. }
  60.  
Success #stdin #stdout 0s 2112KB
comments (?)
stdin 
Standard input is empty
stdout 
Original:
1 2 3 4 5 
6 7 8 9 10 
11 12 13 14 15 
16 17 18 19 20 

Spiral printing:
1  2  3  4  5  10   15   20   19   18   17   16   11   6   7  8  9  14   13   12
https://ideone.com/xLnf2z
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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