C Program to check if the entered matrix is magic square or not

Program

#include<stdio.h>
#define SIZE 3
void main()
{	
	int matrix[3][3];
	int row, column;
	int diagonal_sum, row_sum, col_sum;
	int flag = 0;
	printf("Enter matrix of order 3x3:\n");
	for (row = 0; row < SIZE; row++)
	{
		for (column = 0; column < SIZE; column++)
			scanf("%d", &matrix[row][column]);
	}
	printf("Entered matrix is:\n");
	for (row = 0; row < SIZE; row++)
	{
		for (column = 0; column < SIZE; column++)
		{
			printf("%d\t", matrix[row][column]);
		}
		printf("\n");
	}
	diagonal_sum = 0;
	for (row = 0; row < SIZE; row++)
	{
		for (column = 0; column < SIZE; column++)
		{
			if (row == column)
			diagonal_sum = diagonal_sum + matrix[row][column];
		}
	}
	for (row = 0; row < SIZE; row++)
	{
		row_sum = 0;
		for (column = 0; column < SIZE; column++)
		{
			row_sum = row_sum + matrix[row][column];
		}
		if (diagonal_sum == row_sum)
			flag = 1;
		else
		{
			flag = 0;
			break;
		}
	}
	for (row = 0; row < SIZE; row++)
	{
		col_sum = 0;
		for (column = 0; column < SIZE; column++)
		{
			col_sum = col_sum + matrix[column][row];
		}
		if (diagonal_sum == col_sum)
			flag = 1;
		else
		{
			flag = 0;
			break;
		}
	}
	if (flag == 1)
		printf("Entered matrix is a magic square\n");
	else
		printf("Entered matrix is not a magic square\n");
}

Output 1

Enter matrix of order 3x3:
4
9
2
3
5
7
8
1
6
Entered matrix is:
4       9       2
3       5       7
8       1       6
Entered matrix is a magic square

Output 2

Enter matrix of order 3x3:
5
7
2
9
11
45
68
10
8
Entered matrix is:
5       7       2
9       11      45
68      10      8
Entered matrix is not a magic square