diff --git a/DFS.cpp b/DFS.cpp
index 187bdc5..fb1a7a7 100644
--- a/DFS.cpp
+++ b/DFS.cpp
@@ -1,8 +1,7 @@
 #include<bits/stdc++.h> 
 using namespace std; 
-  
-// Graph class represents a directed graph 
-// using adjacency list representation 
+
+//  Graph class represents a directed graph using adjacency list representation 
 class Graph { 
     int V;    // No. of vertices 
   
diff --git a/dataabstruction.cpp b/dataabstruction.cpp
index 02a41c3..9f9ac24 100644
--- a/dataabstruction.cpp
+++ b/dataabstruction.cpp
@@ -1,20 +1,22 @@
 #include <iostream>    
 using namespace std;    
- class Sum    
-{    
-private: int x, y, z; // private variables  are providing data abstraction in this program
+
+
+class Sum{    
+	private: int x, y, z; // private variables  are providing data abstraction in this program
 public:    
-void add()    
-{    
-cout<<"Enter two numbers: ";    
-cin>>x>>y;    
-z= x+y;    
-cout<<"Sum of two number is: "<<z<<endl;    
-}    
-};    
+	void add()    
+	{    
+		cout<<"Enter two numbers: ";    
+		cin>>x>>y;    
+		z= x+y;    
+		cout<<"Sum of two number is: "<<z<<endl;    
+	}    
+};  
+  
 int main()    
 {    
-Sum sm;    
-sm.add();    
-return 0;    
-}    
\ No newline at end of file
+	Sum sm;    
+	sm.add();    
+	return 0;    
+}