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  1. #include <stdio.h>
  2.  
  3. #define N 99
  4.  
  5. int main()
  6. {
  7.    int n, i, j, magic[N][N] = {0}, row = 0, col;
  8.  
  9.    printf("This programs creates a magic squares of a specified size.\n");
  10.    printf("The size must be an odd number between 1 and 99.\n");
  11.    printf("Enter the size of magic square: ");
  12.    scanf("%d", &n);
  13.  
  14.  
  15.       col = (n-1)/2;     //starting position
  16. 	  magic[row][col] = 1;
  17.  
  18.       for(i = 2; i <= n*n; i++) {
  19. 	     row = (row + n - 1)%n; //the usual moves: column up, row under
  20. 		 col = (col + 1)%n;     //the modulo is a quick solution to the "rolling trouble"
  21. 		 if(magic[row][col] != 0) { //but if that place's occupied, let's move under the last 'i' placed
  22. 		      row = (n + row + 2)%n;
  23. 			  col = (n + col - 1)%n;
  24. 		  }
  25. 			magic[row][col] = i; //and let the cycle starts again
  26. 	   }
  27.  
  28. 	  printf("\n");    //printing the array
  29. 	  for (i = 0; i < n; i++) {                                                     
  30.           for (j = 0; j < n; j++) {                                                 
  31.             printf("%4d", magic[i][j]);                                           
  32.           }                                                                         
  33.       printf("\n");                                                             
  34.      }                                                                             
  35. return 0;                                                                     
  36. }
Success #stdin #stdout 0s 2856KB
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Standard input is empty
stdout
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This programs creates a magic squares of a specified size.
The size must be an odd number between 1 and 99.
Enter the size of magic square:
https://ideone.com/wD2EpN
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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