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  1. #include <stdio.h>
  2.  
  3. #define N 5
  4.  
  5. int main(void) {
  6.     int i,j,dim, val = 1;
  7.     int matrix[N][N];
  8.  
  9.     // perform spiral print
  10.     for (dim = 0; dim < (N+1)/2; dim++)
  11.     {
  12.         // set initial i and go till the "last column"
  13.         i = dim;
  14.         for (j = dim; j < N - dim; j++)
  15.         {
  16.             matrix[i][j] = val++;
  17.         }
  18.  
  19.         // bring back i and j to the proper coordinate
  20.         // and move down to the "last row"
  21.         j--;i++;
  22.         for (; i < N - dim; i++)
  23.         {
  24.             matrix[i][j] = val++;
  25.         }
  26.  
  27.         // bring back i and j to the proper coordinate
  28.         // and move back to the "first column"
  29.         i--;j--;
  30.         for (; j >= dim; j--)
  31.         {
  32.             matrix[i][j] = val++;
  33.         }
  34.  
  35.         // bring back i and j to the proper coordinate
  36.         // and move up to the "first row"
  37.         j++;i--;
  38.         for (; i > dim; i--)
  39.         {
  40.             matrix[i][j] = val++;
  41.         }
  42.     }
  43.  
  44.     // init and print the matrix
  45.     for (i=0; i < N; i++)
  46.     {
  47.         for (j=0; j< N; j++)
  48.         {
  49.             printf("%2d ", matrix[i][j]);
  50.         }
  51.         printf("\n");
  52.     }
  53.  
  54.     return 0;
  55. }
Success #stdin #stdout 0s 9424KB
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Standard input is empty
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 1  2  3  4  5 
16 17 18 19  6 
15 24 25 20  7 
14 23 22 21  8 
13 12 11 10  9
https://ideone.com/vytnxL
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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