Added programs in two section.

GCD/gcd.py

@@ -0,0 +1,13 @@
+def computeGCD(x, y): 
+
+   while(y): 
+       x, y = y, x % y 
+
+   return x 
+
+a = 60
+b= 48
+
+# prints 12 
+print ("The gcd of 60 and 48 is : ",end="") 
+print (computeGCD(60,48)) 

Middle-Element-Linked-List/Middle-Element-Linked-List-C.c

@@ -0,0 +1,62 @@
+#include<stdio.h>  
+#include<stdlib.h>  
+
+struct Node  
+{  
+    int data;  
+    struct Node* next;  
+};  
+
+void printMiddle(struct Node *head)  
+{  
+    struct Node *slow_ptr = head;  
+    struct Node *fast_ptr = head;  
+
+    if (head!=NULL)  
+    {  
+        while (fast_ptr != NULL && fast_ptr->next != NULL)  
+        {  
+            fast_ptr = fast_ptr->next->next;  
+            slow_ptr = slow_ptr->next;  
+        }  
+        printf("The middle element is [%d]\n\n", slow_ptr->data);  
+    }  
+}  
+
+void push(struct Node** head_ref, int new_data)  
+{  
+    struct Node* new_node =  
+        (struct Node*) malloc(sizeof(struct Node));  
+
+    new_node->data = new_data;  
+
+    new_node->next = (*head_ref);  
+
+    (*head_ref) = new_node;  
+}  
+
+void printList(struct Node *ptr)  
+{  
+    while (ptr != NULL)  
+    {  
+        printf("%d->", ptr->data);  
+        ptr = ptr->next;  
+    }  
+    printf("NULL\n");  
+}  
+
+int main()  
+{  
+
+    struct Node* head = NULL;  
+    int i;  
+
+    for (i=5; i>0; i--)  
+    {  
+        push(&head, i);  
+        printList(head);  
+        printMiddle(head);  
+    }  
+
+    return 0;  
+}