How do I print out the value that make magic square? - c++

Question

I have tried this code that I found online and it worked, but I want it to print out which number makes magic square. In this case it is 83, so instead of cout<<"Magic Square", how do I change it to show 83 instead?
Thank you in advance.
# define my_sizeof(type) ((char *)(&type+1)-(char*)(&type))
using namespace std;
// Returns true if mat[][] is magic
// square, else returns false.
bool isMagicSquare(int mat[][3])
{
int n = my_sizeof(mat)/my_sizeof(mat[0]);
// calculate the sum of
// the prime diagonal
int i=0,j=0;
// sumd1 and sumd2 are the sum of the two diagonals
int sumd1 = 0, sumd2=0;
for (i = 0; i < n; i++)
{
// (i, i) is the diagonal from top-left -> bottom-right
// (i, n - i - 1) is the diagonal from top-right -> bottom-left
sumd1 += mat[i][i];
sumd2 += mat[i][n-1-i];
}
// if the two diagonal sums are unequal then it is not a magic square
if(sumd1!=sumd2)
return false;
// For sums of Rows
for (i = 0; i < n; i++) {
int rowSum = 0, colSum = 0;
for (j = 0; j < n; j++)
{
rowSum += mat[i][j];
colSum += mat[j][i];
}
if (rowSum != colSum || colSum != sumd1)
return false;
}
return true;
}
// driver program to
// test above function
int main()
{
int mat[3][3] = {{ 1, 5, 6 },
{ 8, 2, 7 },
{ 3, 4, 9 }};
if (isMagicSquare(mat))
cout << "Magic Square";
else
cout << "Not a magic Square";
return 0;
}
As per suggested, I have tried to change it to:
int main()
{
int mat[3][3] = {{ 1, 5, 6 },
{ 8, 2, 7 },
{ 3, 4, 9 }};
if (isMagicSquare(mat))
{
for(int i = 0; i < 3; i++)
{
for(int j = 0; j < 3; j++)
{
cout<< mat[i][j] << ' ';
}
cout<< endl;
}
}
else
cout << "Not a magic Square";
return 0;
}
But it showed the whole array instead of the correct index in the array. I am sorry, I am somewhat new at the whole thing.
The result is showing up as:
1 5 6
8 2 7
3 4 9
Did I changed it in the wrong place? Or is there any further reading that I should read. Any helps would be appreciate.
The result that I am expecting is
83
as it is the number in the index that is the magic number.

Answer 1

If the given square is a magic square, that means when isMagicSquare(mat) is true, then iterate through the given square and print each of the values.
To do that, you'll have to learn how to print a 2D array.
In your case, you can do like below:
if (isMagicSquare(mat))
{
for(int i = 0; i < 3; i++)
{
for(int j = 0; j < 3; j++)
{
cout<< mat[i][j] << ' ';
}
cout<< endl;
}
}
Please check the below resources to learn more about 2D array:
How to print 2D Arrays in C++
Two Dimensional Array in C++
Multidimensional Arrays in C / C++