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Posted 8 Sep 2003

Magic Square

, 8 Sep 2003
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Calculating Magic Square In Any Order Using Standard Template Library (STL)
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Magic square is an ancient mathematical problem that many people try to solve. May be you see it in some magazines or your teacher might have introduced it in a class.


A magic square is an arrangement of numbers from 1 to n2 in an [n x n] matrix, with each number occurring exactly once, and such that the sum of the entries of any row, any column, or any main diagonal is the same.

It is not hard to show that this sum must be  n [ ( n2 + 1) / 2 ]. If we use this formula for that example output which is below, for [5x5] matrix; 5 [ ( 52 + 1 ) / 2 ] = 65.


Now, I want to show you a way to calculating magic squares in any order by using your talented computer.

Siamese method

This method is useful for calculating magic squares with odd order. It begins by placing a 1 in any location (in the center square of the top row in the above example), then incrementally placing subsequent numbers in the square one unit above and to the right. The counting is wrapped around, so that falling off the top returns on the bottom and falling off the right returns on the left. When a square is encountered which is already filled, the next number is instead placed below the previous one and the method continues as before. The method, also called de la Loubere's method.

For example, if order of square is 5, we have:

void CalculateOddMagicSquare()
  int matrix[5][5];

  int nsqr = n * n;
  int i=0, j=n/2;     // start position

  for (int k=1; k<=nsqr; ++k) 
    matrix[i][j] = k;


    if (k%n == 0) 
      i += 2; 
      if (j==n) 
        j -= n;
      else if (i<0) 
        i += n;

Here is a very nice flash animation to show you how to fill square's cells. Thanks KIVANÇ HiKMET ANAR, for his flash.

Complete Work

Below is full source code of calculating magic squares in any order.

#include "stdafx.h"
#include <vector>

using namespace std;

void OddMagicSquare(vector<vector<int> > &matrix, int n);
void DoublyEvenMagicSquare(vector<vector<int> > &matrix, int n);
void SinglyEvenMagicSquare(vector<vector<int> > &matrix, int n);
void MagicSquare(vector<vector<int> > &matrix, int n);
void PrintMagicSquare(vector<vector<int> > &matrix, int n);

int main(int argc, char* argv[])
  int n;
  printf("Enter order of square: ");
  scanf("%d", &n);

  vector<vector<int> > matrix(n, vector<int> (n, 0));

  if (n<3)
    printf("\nError: n must be greater than 2\n\n");
    return -1;

  MagicSquare(matrix, n);  

  //Print results
  PrintMagicSquare(matrix, n);
  return 0;

void MagicSquare(vector<vector<int> > &matrix,int n)
  if (n%2==1)        //n is Odd
    OddMagicSquare(matrix, n);
  else          //n is even
    if (n%4==0)    //doubly even order
      DoublyEvenMagicSquare(matrix, n);
    else      //singly even order
      SinglyEvenMagicSquare(matrix, n);

void OddMagicSquare(vector<vector<int> > &matrix, int n)
  int nsqr = n * n;
  int i=0, j=n/2;     // start position

  for (int k=1; k<=nsqr; ++k) 
    matrix[i][j] = k;


    if (k%n == 0) 
      i += 2; 
      if (j==n) 
        j -= n;
      else if (i<0) 
        i += n;

void DoublyEvenMagicSquare(vector<vector<int> > &matrix, int n)
  vector<vector<int> > I(n, vector<int> (n, 0));
  vector<vector<int> > J(n, vector<int> (n, 0));

  int i, j;

  //prepare I, J
  int index=1;
  for (i=0; i<n; i++)
    for (j=0; j<n; j++)

  for (i=0; i<n; i++)
    for (j=0; j<n; j++)
      if (I[i][j]==J[i][j])

void SinglyEvenMagicSquare(vector<vector<int> > &matrix, int n)
  int p=n/2;

  vector<vector<int> > M(p, vector<int> (p, 0));
  MagicSquare(M, p);
  int i, j, k;

  for (i=0; i<p; i++)
    for (j=0; j<p; j++)

  if (n==2)

  vector<int> I(p, 0);
  vector<int> J;

  for (i=0; i<p; i++)

  for (i=1; i<=k; i++)

  for (i=n-k+2; i<=n; i++)

  int temp;
  for (i=1; i<=p; i++)
    for (j=1; j<=J.size(); j++)

  //j=1, i
  //i=k+1, k+1+p
  temp=matrix[i][j]; matrix[i][j]=matrix[i+p][j]; matrix[i+p][j]=temp;

  temp=matrix[i+p][j]; matrix[i+p][j]=matrix[i][j]; matrix[i][j]=temp;

void PrintMagicSquare(vector<vector<int> > &matrix, int n)
  for (int i=0; i<n; i++) 
    for (int j=0; j<n; j++)
      printf(" %3d", matrix[i][j]);






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About the Author

A. Riazi
CEO Misbah3Com
Iran (Islamic Republic of) Iran (Islamic Republic of)
I was born in Shiraz, a very beautiful famous city in Iran. I started programming when I was 12 years old with GWBASIC. Since now, I worked with various programming languages from Basic, Foxpro, C/C++, Visual Basic, Pascal to MATLAB and now Visual C++.
I graduated from Iran University of Science & Technology in Communication Eng., and now work as a system programmer for a telecommunication industry.
I wrote several programs and drivers for Synthesizers, Power Amplifiers, GPIB, GPS devices, Radio cards, Data Acqusition cards and so many related devices.
I'm author of several books like Learning C (primary and advanced), Learning Visual Basic, API application for VB, Teach Yourself Object Oriented Programming (OOP) and etc.
I'm winner of January, May, August 2003 and April 2005 best article of month competetion, my articles are:

You can see list of my articles, by clicking here

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Comments and Discussions

QuestionWhat's wrong with my Magic Square program? Pin
Trevon Harris21-Feb-15 20:25
memberTrevon Harris21-Feb-15 20:25 
Generalthank you...... Pin
aravindanne24-Jan-12 5:24
memberaravindanne24-Jan-12 5:24 
Questiona more general algorithm for generating magic squares Pin
ashishkumar3666-Nov-11 12:15
memberashishkumar3666-Nov-11 12:15 
Questionprogram of magic square Pin
30-Aug-11 15:58
member30-Aug-11 15:58 
Questionmagic square program Pin
sheila mejos30-Aug-11 15:09
membersheila mejos30-Aug-11 15:09 
Questiondomino problem Pin
SOLR@C21-May-11 15:59
memberSOLR@C21-May-11 15:59 
Generalhelp me Pin
mashmal11-Apr-11 11:47
membermashmal11-Apr-11 11:47 
Generalhelp me please to expand my knowledge in programming.. Pin
nycshoes0317-Jul-09 17:12
membernycshoes0317-Jul-09 17:12 
Generalmagic square Pin
samantha0315-Jul-09 19:56
membersamantha0315-Jul-09 19:56 
Questionhelp me plzz Pin
dongky19864-Feb-09 1:41
memberdongky19864-Feb-09 1:41 
Questionproblem Pin
3-Sep-08 8:54
member3-Sep-08 8:54 
GeneralHelp_Magic Square Pin
00713-Jan-08 4:45
member00713-Jan-08 4:45 
QuestionCan anyone help with this program [modified] Pin
Well Alright 200411-Jun-07 14:14
memberWell Alright 200411-Jun-07 14:14 
QuestionSolvin a Magic Saquare in other method Pin
Nizar Hawat6-Jan-07 11:45
memberNizar Hawat6-Jan-07 11:45 
GeneralHeLP me to solve this probLem, pLease! Pin
winche9-May-06 2:12
memberwinche9-May-06 2:12 
Generalhelp Pin
Shay00730-Mar-06 19:55
memberShay00730-Mar-06 19:55 
GeneralMagic Square Flaw Pin
bugDanny26-Sep-05 3:56
memberbugDanny26-Sep-05 3:56 
GeneralRe: Magic Square Flaw Pin
A. Riazi26-Sep-05 4:10
memberA. Riazi26-Sep-05 4:10 
GeneralRe: Magic Square Flaw Pin
bugDanny26-Sep-05 4:18
memberbugDanny26-Sep-05 4:18 
Generalhi prof Pin
Anonymous24-Sep-05 17:24
memberAnonymous24-Sep-05 17:24 
GeneralComplete Distributed Solution Pin
MagicSquareJoe22-Jul-04 17:22
memberMagicSquareJoe22-Jul-04 17:22 
GeneralYour Complete Work Pin
Anonymous15-Nov-03 14:55
memberAnonymous15-Nov-03 14:55 
GeneralRe: Your Complete Work Pin
Anthony_Yio21-Dec-03 21:32
memberAnthony_Yio21-Dec-03 21:32 
GeneralRe: Your Complete Work Pin
Giles13-Sep-04 2:53
memberGiles13-Sep-04 2:53 
GeneralRe: Your Complete Work Pin
Anonymous18-Sep-04 14:49
memberAnonymous18-Sep-04 14:49 

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