From 896d03f76ce497dea96f667831b92071f917e5f2 Mon Sep 17 00:00:00 2001
From: rakesh kumar <rakesh@binarynote.com>
Date: Thu, 10 May 2018 22:53:16 +0530
Subject: [PATCH] data structure queue

---
 DataStructure/queue.py | 34 ++++++++++++++++++++++++++++++++++
 DataStructure/stack.py | 32 +++++++++++++++++++++++++++++++-
 2 files changed, 65 insertions(+), 1 deletion(-)
 create mode 100644 DataStructure/queue.py

diff --git a/DataStructure/queue.py b/DataStructure/queue.py
new file mode 100644
index 0000000..def1c7f
--- /dev/null
+++ b/DataStructure/queue.py
@@ -0,0 +1,34 @@
+#function to add element at the end of list
+def add_element(stack,x):
+    stack.append(x)
+#function to remove last element from list    
+def delete_element(stack):
+    n = len(stack)
+    if(n<=0):
+        print("Queue empty....Deletion not possible")
+    else:
+        del(stack[0])
+
+#function to display stack entry
+def display(stack):
+    if len(stack)<=0:
+        print("Queue empty...........Nothing to display")
+    for i in stack:
+        print(i,end=" ")
+#main program starts from here 
+x=[]
+choice=0
+while (choice!=4):
+    print("\n\tQueue menu \n\n\t1. Add Element \n\t2. Delete Element \n\t3. Display \n\t4. Exit")
+    choice = int(input("\n Enter your choice : "))
+    
+    if(choice==1):
+        value = int(input("Enter value : "))
+        add_element(x,value)
+    if(choice==2):
+        delete_element(x)
+    if(choice==3):
+        display(x)
+    if(choice==4):
+        print("You selected to close this program")
+    
diff --git a/DataStructure/stack.py b/DataStructure/stack.py
index 8f0e3b8..7c6445b 100644
--- a/DataStructure/stack.py
+++ b/DataStructure/stack.py
@@ -1,4 +1,34 @@
+#function to add element at the end of list
 def push(stack,x):
     stack.append(x)
+#function to remove last element from list    
 def pop(stack):
-    del(stack[])
+    n = len(stack)
+    if(n<=0):
+        print("Stack empty....Pop not possible")
+    else:
+        stack.pop()
+
+#function to display stack entry
+def display(stack):
+    if len(stack)<=0:
+        print("Stack empty...........Nothing to display")
+    for i in stack:
+        print(i,end=" ")
+#main program starts from here 
+x=[]
+choice=0
+while (choice!=4):
+    print("\n\t\t\t stack menu \n\t1. push \n\t2. pop \n\t3. Display \n\t4. Exit")
+    choice = int(input("Enter your choice"))
+    
+    if(choice==1):
+        value = int(input("Enter value "))
+        push(x,value)
+    if(choice==2):
+        pop(x)
+    if(choice==3):
+        display(x)
+    if(choice==4):
+        print("You selected to close this program")
+