Diagonal Difference | Hacker Rank Solution in C

Problem:

Given a square matrix, calculate the absolute difference between the sums of its diagonals.

For example, the square matrix  is shown below:

1 2 3
4 5 6
9 8 9  

The left-to-right diagonal = . The right to left diagonal = . Their absolute difference is .

Solution:

#include <stdio.h>

#include <string.h>

#include <math.h>

#include <stdlib.h>

int main()

{

    int a[100][100],n,c=0,d=0,i,j,sum=0;

    scanf("%d",&n);

    for(i=0;i<n;i++)

        for(j=0;j<n;j++)

            scanf("%d",&a[i][j]);

    for(i=0;i<n;i++)

         c=c+a[i][i];        

    for(i=0;i<n;i++)

         d=d+a[i][n-1-i];

    sum=abs(c-d);

    printf("%d",sum);

          

  

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  

    return 0;

}