C Program to Find Sum of Diagonals of Matrix

Here is the C program to find sum of diagonal of a square matrix.

#include<stdio.h>

int main()
{
	int i,j,n,d1=0,d2=0,a[5][5];
	printf("Enter size of square matrix:");
	scanf("%d",&n);
	printf("Enter Elements of matrix:\n");
	
	for(i=0;i<n;++i)
		for(j=0;j<n;++j)
		{
			scanf("%d",&a[i][j]);
			if(i==j)
				d1+=a[i][j];
			if((i+j)==(n-1))
				d2+=a[i][j];
		}
		
	printf("\nFirst Diagonal Sum=%d",d1);
	printf("\nSecond Diagonal Sum=%d",d2);

	return 0;
}

Output

Enter size of square matrix:4
Enter Elements of matrix:
1 2 3 4
5 6 7 8
9 10 11 12
10 7 6 8

First Diagonal Sum=26
Second Diagonal Sum=31