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### find out SUM of diagonal elements of a MATRIX in c language | CTechnotips

Sum of diagonal element of matrix:

Diagonal elements have been shown in the bold letter.

We can observer the properties any element Aij will diagonal element if and only if i = j

Sum of diagonal elements of a matrix in c

#include<stdio.h>

int main(){

int a[10][10],i,j,sum=0,m,n;

printf("\nEnter the row and column of matrix: ");
scanf("%d %d",&m,&n);

printf("\nEnter the elements of matrix: ");
for(i=0;i<m;i++)
for(j=0;j<n;j++)
scanf("%d",&a[i][j]);
printf("\nThe matrix is\n");

for(i=0;i<m;i++){
printf("\n");
for(j=0;j<m;j++){
printf("%d\t",a[i][j]);
}
}
for(i=0;i<m;i++){
for(j=0;j<n;j++){
if(i==j)
sum=sum+a[i][j];
}
}
printf("\n\nSum of the diagonal elements of a matrix is: %d",sum);

return 0;
}

Sample output:

Enter the row and column of matrix: 3 3
Enter the elements of matrix: 2
3
5
6
7
9
2
6
7
The matrix is
2       3       5
6       7       9
2       6       7
Sum of the diagonal elements of a matrix is: 16