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  1. #include <stdio.h>
  2.  
  3. #define N 5
  4.  
  5. int main(void) {
  6. 	int i,j,dim;
  7. 	int matrix[N][N];
  8.  
  9. 	// init and print the matrix
  10. 	for (i=0; i < N; i++)
  11. 	{
  12. 		for (j=0; j< N; j++)
  13. 		{
  14. 			matrix[i][j] = i*N + j;
  15. 			printf("%2d ", matrix[i][j]);
  16. 		}
  17. 		printf("\n");
  18. 	}
  19.  
  20. 	printf("\n");
  21.  
  22. 	// perform spiral print
  23. 	for (dim = 0; dim < (N+1)/2; dim++)
  24. 	{
  25. 		// set initial i and go till the "last colomn"
  26. 		i = dim;
  27. 		for (j = dim; j < N - dim; j++)
  28. 		{
  29. 			printf("%2d ", matrix[i][j]);
  30. 		}
  31. 		printf("\n");
  32.  
  33. 		// bring back i and j to the proper coordinate
  34. 		// and move down to the "last row"
  35. 		j--;i++;
  36. 		for (i=dim+1; i < N - dim; i++)
  37. 		{
  38. 			printf("%2d ", matrix[i][j]);
  39. 		}
  40. 		printf("\n");
  41.  
  42. 		// bring back i and j to the proper coordinate
  43. 		// and move back to the "first colomn"
  44. 		i--;j--;
  45. 		for (; j >= dim; j--)
  46. 		{
  47. 			printf("%2d ", matrix[i][j]);
  48. 		}
  49. 		printf("\n");
  50.  
  51. 		// bring back i and j to the proper coordinate
  52. 		// and move up to the "first row"
  53. 		j++;i--;
  54. 		for (; i > dim; i--)
  55. 		{
  56. 			printf("%2d ", matrix[i][j]);
  57. 		}
  58. 		printf("\n");
  59. 	}
  60.  
  61. 	return 0;
  62. }
Success #stdin #stdout 0s 9424KB
comments ()
stdin 
Standard input is empty
stdout 
 0  1  2  3  4 
 5  6  7  8  9 
10 11 12 13 14 
15 16 17 18 19 
20 21 22 23 24 

 0  1  2  3  4 
 9 14 19 24 
23 22 21 20 
15 10  5 
 6  7  8 
13 18 
17 16 
11 
12
https://ideone.com/UogBnc
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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