# Write a program to evaluate the addition of diagonal elements of two square matrixes.

Code:-

#include<stdio.h>
int main()
{
int a,b,i,j,n1,n2,sum1=0,sum2=0;
printf(“Enter size of both arrayn”);
scanf(“%d%d”,&n1,&n2);
printf(“Enter elements of the first matrixn”);
for(i=0;i<n1;i++)
{
for(j=0;j<n1;j++)
scanf(“%d”,&a[i][j]);
}
printf(“Enter elements of the second matrixn”);
for(i=0;i<n2;i++)
{
for(j=0;j<n2;j++)
scanf(“%d”,&b[i][j]);
}
// logic for calculating sum of digonal of first matrix
for(i=0;i<n1;i++)
{
for(j=0;j<n1;j++)
{
if(j==i)
sum1=sum1+a[i][j];
}
}
// logic for calculating sum of digonal of second matrix
for(i=0;i<n2;i++)
{
for(j=0;j<n2;j++)
{
if(j==i)
sum2=sum2+b[i][j];
}
}
printf(“Sum of digonal elements of the first matrix is: %dn”,sum1);
printf(“Sum of digonal elements of the second matrix is: %dn”,sum2);
printf(“Total Sum of digonal elements of the both matrix is: %d”,sum1+sum2);
return 0;
}

Output:-

Enter size of the both array
3 3
Enter element of the first array
1 2 3
2 3 4
1 1 1
Enter element of the array
4 5 6
1 1 2
1 2 0
Sum of the digonal element of the first matrix is: 5
Sum of the digonal element of the second matrix is: 5
Total sum of the digonal elements of the both matrix is: 10