Updated

Author: ayanujju

Diagonal-Difference.c

@@ -2,28 +2,30 @@
 #include <math.h>
 int main()
 {
-    int n,i,j,sum1=0,sum2=0;
+    int n,i,j,sum1=0,sum2=0; //n denotes the number of rows and columns in the matrix arr.
 
     scanf("%d", &n);
-    int a[n][n];
+    int arr[n][n];
     for (i=0;i<n;i++)
     {
         for (j=0;j<n;j++)
         {
-            scanf("%d ", &a[i][j]);
-            if(a[i][j]>=-100&&a[i][j]<=100)
+            scanf("%d ", &arr[i][j]);
+            //Taking diagonal sum of the matrix arr from the both side
+            if(arr[i][j]>=-100 && arr[i][j]<=100)
             {
                 if(i==j)
                 {
-                    sum1+=a[i][j];
+                    sum1+=arr[i][j];
                 }
                 if(j==(n-1-i))
                 {
-                    sum2+=a[i][j];
+                    sum2+=arr[i][j];
                 }
             }
         }
     }
+    // This code part belongs to the absolute difference between the sums of the matrix's along two diagonals
     if((sum1-sum2)<0)
     {
         printf("%d", (-((sum1)-(sum2))));
@@ -37,12 +39,29 @@ int main()
 
 /*
 Sample Input
-4
--1  1 -7 -8
--10 -8 -5 -2
-0 9 7 -1
-4 4 -2 1
-
-Output
-1
+
+3
+11 2 4
+4 5 6
+10 8 -12
+Sample Output
+
+15
+
+Explanation
+
+The primary diagonal is:
+
+11
+   5
+     -12
+Sum across the primary diagonal: 11 + 5 - 12 = 4
+
+The secondary diagonal is:
+
+     4
+   5
+10
+Sum across the secondary diagonal: 4 + 5 + 10 = 19
+Difference: |4 - 19| = 15
 */