Added solution

Diagonal-Difference.c

@@ -0,0 +1,67 @@
+#include <stdio.h>
+#include <math.h>
+int main()
+{
+    int n,i,j,sum1=0,sum2=0; //n denotes the number of rows and columns in the matrix arr.
+
+    scanf("%d", &n);
+    int arr[n][n];
+    for (i=0;i<n;i++)
+    {
+        for (j=0;j<n;j++)
+        {
+            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+=arr[i][j];
+                }
+                if(j==(n-1-i))
+                {
+                    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))));
+    }
+    else
+    {
+        printf("%d", ((sum1)-(sum2)));
+    } 
+    return 0; 
+}
+
+/*
+Sample Input
+
+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
+*/