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

Here is the simple C program to find sum of elements above and below main diagonal of matrix. The matrix should be square matrix.

#include<stdio.h>

int main()
{
	int i,j,m,n,d1=0,d2=0,a[5][5];
	printf("How many rows and columns:");
	scanf("%d%d",&m,&n);
	printf("Enter matrix elements:\n");
	
	for(i=0;i<m;++i)
		for(j=0;j<n;++j)
		{
			scanf("%d",&a[i][j]);
				if(j>i)
					d1+=a[i][j];
				else
					if(i>j)
						d2+=a[i][j];
		}
	
	printf(\n"Sum of elements above the diagonal=%d\n",d1);
	printf("Sum of elements below the diagonal=%d",d2);

	return 0;
}

Output

How many rows and columns:3 3
Enter matrix elements:
4 12 7
4 5 2
1 0 3

Sum of elements above the diagonal=21
Sum of elements below the diagonal=5