Magic Square Program (C++)

Question

For those unfamiliar with the classic magic square algorithm: A magic square is a two dimensional array (nxn) which contains a numerical value between the values 1 and n^2 in each location. Each value may appear only once. Furthermore, the sum of each row, column and diagonal must be the same. The input should be odd as I am writing an odd magic square solution.

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I have completed the problem but as of now it has an unknown bug (logic? output?) that has been vexing me for the past hour. The values that are output are very off mark. Any help would be very much appreciated:

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#include<iostream>
#include<iomanip>
using namespace std;

int main()
{
  int n;

  cout<< "Please enter an odd integer: ";
  cin>>n;

  int MagicSquare[n][n];


  int newRow,
  newCol;

  // Set the indices for the middle of the bottom i
  int i =0 ;
  int j= n / 2;

  // Fill each element of the array using the magic array
  for ( int value = 1; value <= n*n; value++ )
  {
     MagicSquare[i][j] = value;
     // Find the next cell, wrapping around if necessary.
     newRow = (i + 1) % n;
     newCol = (j + 1) % n;
     // If the cell is empty, remember those indices for the
     // next assignment.
     if ( MagicSquare[newRow][newCol] == 0 )
     {
        i = newRow;
        j = newCol;
     }
     else
     {
        // The cell was full. Use the cell above the previous one.
        i = (i - 1 + n) % n;
     }

  }


  for(int x=0; x<n; x++)
  {
     for(int y=0; y<n; y++)
         cout << MagicSquare[x][y]<<" ";
     cout << endl;
  }
}

Answer 1

You forgot to initialize your MagicSquare to contain all zeros:

  for(int i = 0; i < n; i++) {
    for(int j = 0; j < n; j++) {
      MagicSquare[i][j] = 0;
    }
  }

Thus this check will almost always fail:

if ( MagicSquare[newRow][newCol] == 0 ) {
   i = newRow;
   j = newCol;
}

As C/++ doesn't initialize them to 0 for you.

Answer 2

#include<iostream.h>
#include<iomanip.h>
int main()
{
     int arr[25][25]={0};
     cout<<"Enter size(odd):";
     int size;
     cin>>size;
     int i=0,j=(size-1)/2,n=1;
     arr[i][j]=n;
     while(n<=size*size){
           i--;
           j--;
           if(i<0&&j>=0){
                i=size-1;
                arr[i][j]=n;
                n++;
          }else if(j<0&&i>=0){
                j=size-1;
                arr[i][j]=n;
                n++;
          }else if(i<0&&j<0){
                i=i+2;
                j=j+1;
                arr[i][j]=n;
                n++;
          }else if(arr[i][j]!=0){
                i=i+2;
                j=j+1;
                arr[i][j]=n;
                n++;
          }else{  
                arr[i][j]=n;
                n++;
          }
      }
      for(i=0,i<ize;i++){  
            for(j=0,j<size;j++){
                  cout<<setw(3)<<arr[i][j];
            }
            cout<<endl;
      }
      return 0;
  }

Answer 3

你不能从用户那里取n，因为你必须用常数定义数组的大小

Answer 4

您应该创建动态数组以便从键盘中侦听维度，但不要忘记在不需要时删除数组

Answer 5

you must initialize contain all elements to zeros:

  memset(MagicSquare, 0, sizeof(MagicSquare));

Othewise it show garbage value.
NB: memset function include in cstring header file.

Your corrected code :

#include<iostream>
#include<iomanip>
#include <cstring>
using namespace std;

int main()
{
  int n;

// cout<< "Please enter an odd integer: ";
  cin>>n;

  int MagicSquare[n][n];


  int newRow,
  newCol;
   memset(MagicSquare, 0, sizeof(MagicSquare));
  // Set the indices for the middle of the bottom i
  int i =0 ;
  int j= n / 2;

  // Fill each element of the array using the magic array
  for ( int value = 1; value <= n*n; value++ )
  {
     MagicSquare[i][j] = value;
     // Find the next cell, wrapping around if necessary.
     newRow = (i + 1) % n;
     newCol = (j + 1) % n;
     // If the cell is empty, remember those indices for the
     // next assignment.
     if ( MagicSquare[newRow][newCol] == 0 )
     {
        i = newRow;
        j = newCol;
     }
     else
     {
        // The cell was full. Use the cell above the previous one.
        i = (i - 1 + n) % n;
     }

  }


  for(int x=0; x<n; x++)
  {
     for(int y=0; y<n; y++)
         cout << MagicSquare[x][y]<<" ";
     cout << endl;
  }
}