diff --git a/a.out b/a.out
new file mode 100755
index 0000000..ff0c38d
Binary files /dev/null and b/a.out differ
diff --git a/call by value, call by reference, call by address b/call by value, call by reference, call by address
index 6e8d1a6..bf9ddc3 100644
--- a/call by value, call by reference, call by address	
+++ b/call by value, call by reference, call by address	
@@ -3,10 +3,9 @@
 using namespace std;
 void swap(int a,int b)
 {
-  int temp;
-  temp=a;
-  a=b;
-  b=temp;
+  a=a+b;
+  b=a-b;
+  a=a-b;
   
   //number after swaping
   cout<<a<<b;
diff --git a/q-12.cpp b/q-12.cpp
index 9b0acd6..10c658e 100644
--- a/q-12.cpp
+++ b/q-12.cpp
@@ -9,22 +9,23 @@ n value is not provided, it should print ‘*’ character 80 times.
 
 using namespace std;
 
-void displayChar(int n = 80, char ch = '*')
-{
-    for (int i = 0; i < n; i++)
-    {
-        cout << ch << " ";
-    }
-    cout << endl;
-}
-
-int main()
-{
-    int n;
-    char ch;
-    cin >> n >> ch;
+void dispChar(int =80, char ='*'); 
 
-    displayChar(n, ch);
 
-    return 0;
+int main() 
+{ 
+        int n;
+        char ch;
+        cin>>n>>ch;         
+        dispChar();
+        dispChar(n,ch);
+        
+	return 0; 
 }
+
+void dispChar(int j,char c)
+{
+ 
+ for(int i=0;i<j;i++)
+ cout<<c<<"\t";
+}