Find Sum of Diagonals elements in a Matrix.cpp

/*  C++ Program to Find Sum of Diagonals elements in a Matrix  */

#include<iostream>

using namespace std;

int main()
{
    int a[10][10],d1sum=0,d2sum=0,m,i,j;
    cout<<"Enter size of matrix :: ";
    cin>>m;
    cout<<"\nEnter Elements to Matrix Below :: \n";

    for(i=0;i<m;i++)
    {
        for(j=0;j<m;++j)
        {
            cout<<"\nEnter a["<<i<<"]["<<j<<"] Element :: ";
            cin>>a[i][j];
        }

    }

    cout<<"\nThe given matrix is :: \n\n";
        for (i = 0; i < m; ++i)
        {
            for (j = 0; j < m; ++j)
            {
                cout<<"\t"<<a[i][j];
            }
            printf("\n\n");
        }



    for(i=0;i<m;++i)
        for(j=0;j<m;++j)
        {
            if(i==j)
                d1sum+=a[i][j];
            if(i+j==(m-1))
                d2sum+=a[i][j];
        }

    cout<<"\nSum of 1st diagonal is :: "<<d1sum;
    cout<<"\n\nSum of 2nd diagonal is :: "<<d2sum;

    return 0;
}