Magic Square

• Problem Description

  
  A magic square is an arrangement of numbers (usually integers) in a square grid, where the numbers in each row, and in each column, and the numbers in the forward and backward main diagonals, all add up to the same number
  
  
  Input Format:
  
  The input consists of (n*n+1) integers. The first integer corresponds to the number of rows/columns in the matrix. The remaining integers correspond to the elements in the matrix. The elements are read in rowwise order, first row first, then second row and so on. Assume that the maximum value of m and n is 5.
  

• Test Case 1

  
  Input (stdin)

  4 9 2
  
  3 5 7
  
  9 3 5
  
  

  Expected Output

  Not a Magic Square

• Test Case 2

  
  Input (stdin)

  4 9 2
  
  3 5 7
  
  8 1 6
  
  

  Expected Output

  Magic Square

• Program

• #include<stdio.h>
   
  int main() {
     int size = 3;
     int matrix[3][3]; // = {{4,9,2},{3,5,7},{8,1,6}};
     int row, column = 0;
     int sum, sum1, sum2;
     int flag = 0;
   
     for (row = 0; row < size; row++) {
        for (column = 0; column < size; column++)
           scanf("%d", &matrix[row][column]);
     }
   
   
     //For diagonal elements
     sum = 0;
     for (row = 0; row < size; row++) {
        for (column = 0; column < size; column++) {
           if (row == column)
              sum = sum + matrix[row][column];
        }
     }
   
     //For Rows
     for (row = 0; row < size; row++) {
        sum1 = 0;
        for (column = 0; column < size; column++) {
           sum1 = sum1 + matrix[row][column];
        }
        if (sum == sum1)
           flag = 1;
        else {
           flag = 0;
           break;
        }
     }
   
     //For Columns
     for (row = 0; row < size; row++) {
        sum2 = 0;
        for (column = 0; column < size; column++) {
           sum2 = sum2 + matrix[column][row];
        }
        if (sum == sum2)
           flag = 1;
        else {
           flag = 0;
           break;
        }
     }
   
     if (flag == 1)
        printf("\nMagic Square");
     else
        printf("\nNot a Magic Square ");
   
     return 0;
  }