C++ Program to Find Sum of Elements Above and Below Main Diagonal of Matrix

Here is the C++ program to find sum of elements above and below the main diagonal of square matrix.

#include<iostream>

using namespace std;

int main()
{
	int arr[5][5],a=0,b=0,i,j,n;
	cout<<"Enter size of matrix(max 5):";
	cin>>n;
	cout<<"Enter the matrix:\n";
	
	for(i=0;i<n;++i)
		for(j=0;j<n;++j)
			cin>>arr[i][j];
	
	for(i=0;i<n;++i)
		for(j=0;j<n;++j)
			if(j>i)
				a+=arr[i][j];
			else
				if(i>j)
					b+=arr[i][j];
	
	cout<<"\nSum of elements above the diagonal:"<<a;
	cout<<"\nSum of elements below the diagonal:"<<b;

	return 0;
}

Output

Enter size of matrix(max 5):3
Enter the matrix:
1 2 3
4 5 6
3 0 2

Sum of elements above the diagonal:11
Sum of elements below the diagonal:7