diff --git a/Data Structure Algo/C++/linked list.cpp b/Data Structure Algo/C++/linked list.cpp
new file mode 100644
index 00000000..e4b572f8
--- /dev/null
+++ b/Data Structure Algo/C++/linked list.cpp	
@@ -0,0 +1,96 @@
+
+\#include<bits/stdc++.h>
+using namespace std;
+struct node{
+	int data;
+	node* link;
+};
+struct node* head;
+void Insert_start(int x){
+	node* temp = new node();
+	temp->data=x;
+	temp->link=head;
+	head=temp;
+	
+}
+void reverse(){
+	node* prev=NULL;
+	node* curr=head;
+	node* next;
+	while(curr!=NULL){
+		next=curr->link;
+		curr->link=prev;
+		prev=curr;
+		curr=next;
+		//next=next->link;
+	}
+	head=prev;
+}
+void Insert_nth(int x, int n){
+	node* temp1=head;
+	node* temp2 = new node();
+	temp2->data=x;
+	if(n==1){
+		temp2->link=head;
+		head=temp2;
+		return;
+	}
+	for(int i=0;i<n-2;i++){
+		temp1=temp1->link;
+	}
+	temp2->link=temp1->link;
+	temp1->link=temp2;
+}
+void Delete(int n){
+	node* temp1=head;
+	if(n==1){
+		head=temp1->link;
+		return;
+	}
+	for(int i=0;i<n-2;i++){
+		temp1=temp1->link;
+	}
+	node* temp2=temp1->link;
+	temp1->link=temp2->link;
+	free(temp2);
+}
+void print(){
+	node* temp=head;
+	while(temp!=NULL){
+		printf("%d\t",temp->data);
+		temp=temp->link;
+	}
+	printf("\n");
+}
+void rec_print_start(node* p){
+	//node* temp=head;
+	if(p==NULL) return;
+	cout<<p->data<<"\t";
+	rec_print_start(p->link);
+}
+void rec_print_end(node* p){
+	//node* temp=head;
+	if(p==NULL) return;
+	rec_print_end(p->link);
+	cout<<p->data<<"\t";
+}
+int main(){
+	int i,n,x,y;
+	head=NULL;
+	printf("How many nos? ");
+	scanf("%d",&n);
+	for(i=0;i<n;i++){
+		printf("Enter no: ");
+		scanf("%d%d",&x,&y);
+		Insert_nth(x,y);
+		print();
+	}
+	Delete(3);
+	print();
+	reverse();
+	print();
+	rec_print_end(head);
+	cout<<"\n";
+	rec_print_start(head);
+	cout<<"\n";
+}
diff --git a/Data Structure Algo/C++/patterns.cpp b/Data Structure Algo/C++/patterns.cpp
new file mode 100644
index 00000000..b9f899ff
--- /dev/null
+++ b/Data Structure Algo/C++/patterns.cpp	
@@ -0,0 +1,14 @@
+#include<bits/stdc++.h>
+using namespace std;
+bool prime(int n){
+	for(int i=2;i<n/2;i++){
+		if(n%i==0) return false;
+	}
+	return true;
+}
+int main(){
+	int n;
+	cin>>n;
+	if(prime(n)) cout<<"prime";
+	else cout<<"non prime";
+}
diff --git a/Data Structure Algo/C++/queue using arrray.cpp b/Data Structure Algo/C++/queue using arrray.cpp
new file mode 100644
index 00000000..b3ca9d5e
--- /dev/null
+++ b/Data Structure Algo/C++/queue using arrray.cpp	
@@ -0,0 +1,48 @@
+#include<bits/stdc++.h>
+using namespace std;
+int a[51];
+int front =-1;
+int rear =-1;
+void enqueue(int x){
+	if(rear==51){
+		cout<<"underflow";
+		return;
+	}
+	if(front==-1) front++;
+	a[++rear]=x;
+}
+void dequeue(){
+	if(front==-1 && rear==-1){
+		cout<<"underflow";
+		return;
+	}
+	if(front==rear){
+		front=-1;
+		rear=-1;
+		return;
+	}
+	front++;
+}
+bool isEmpty(){
+	if(rear==-1 && front==-1) return true;
+	return false;
+}
+void print(){
+	for(int i=front;i<=rear;i++){
+		cout<<a[i]<<" ";
+	}
+	cout<<endl;
+}
+int main(){
+	int n,x;
+	cout<<"Enter n: ";
+	cin>>n;
+	while(n--){
+		cout<<"Enter x: ";
+		cin>>x;
+		enqueue(x);
+	}
+	print();
+	dequeue();
+	print();
+}
diff --git a/Data Structure Algo/C++/queue using linkedlist.cpp b/Data Structure Algo/C++/queue using linkedlist.cpp
new file mode 100644
index 00000000..c4913e97
--- /dev/null
+++ b/Data Structure Algo/C++/queue using linkedlist.cpp	
@@ -0,0 +1,50 @@
+#include<bits/stdc++.h>
+using namespace std;
+struct node{
+	int data;
+	node* next;
+	
+};
+node* rear=NULL;
+node* front=NULL;
+void enqueue(int x){
+	node* temp=new node();
+	temp->data=x;
+	temp->next=NULL;
+	if(rear=NULL){
+		rear=temp;
+		return;
+	} 
+	rear->next=temp;
+	rear=temp;
+	return;
+}
+void dequeue(){
+	if(front=NULL){
+		cout<<"underflow";
+		return;
+	}
+	node* temp=front;
+	front=temp->next;
+	free(temp);
+}
+void print(){
+	node* temp=front;
+	while(temp!=NULL){
+		cout<<temp->data<<" ";
+		temp=temp->next;
+	}
+}
+int main(){
+	int n,x;
+	cout<<"Enter n: ";
+	cin>>n;
+	while(n--){
+		cout<<"Enter x: ";
+		cin>>x;
+		enqueue(x);
+	}
+	print();
+	dequeue();
+	print();
+}
diff --git a/Data Structure Algo/C++/reverse linkedlist.cpp b/Data Structure Algo/C++/reverse linkedlist.cpp
new file mode 100644
index 00000000..4d32eb47
--- /dev/null
+++ b/Data Structure Algo/C++/reverse linkedlist.cpp	
@@ -0,0 +1,27 @@
+#include<bits/stdc++.h>
+using namespace std;
+struct node{
+	int data;
+	node* next;
+};
+struct node* head;
+void print(){
+	node* temp=head;
+	while(temp->next!=NULL){
+		cout<<temp->data<<"\t";
+		temp=temp->next;
+	}
+	cout<<"\n";
+}
+int main(){
+	node* prev=NULL;
+	node* curr=head;
+	node*next;
+	while(curr->next!=NULL){
+		next=curr->next;
+		curr->next=prev;
+		prev=curr;
+		curr=next;
+		next=next->next;
+	}
+}
diff --git a/Data Structure Algo/C++/stack using array.cpp b/Data Structure Algo/C++/stack using array.cpp
new file mode 100644
index 00000000..ba47ccec
--- /dev/null
+++ b/Data Structure Algo/C++/stack using array.cpp	
@@ -0,0 +1,43 @@
+#include<bits/stdc++.h>
+using namespace std;
+int p=51;
+int Stack[50];
+int top=-1;
+void push(int x){
+	if(top==50){
+		cout<<"stack iis full";
+		return;
+	}
+	Stack[++top]=x;
+}
+void pop(){
+	if(top==-1){
+		cout<<"stack is empty";
+		return;
+	}
+	top--;
+}
+void print(){
+	for(int i=0;i<=top;i++){
+		cout<<Stack[i]<<" ";
+	}
+}
+void Top(){
+	cout<<Stack[top];
+}
+bool isEmpty(){
+	if(top==-1) return true;
+	return false;
+}
+int main(){
+	int n,x;
+	cout<<"Enter how many numbers to enter: ";
+	cin>>n;
+	for(int i=0;i<n;i++){
+		cout<<"Enter no to push in stack: ";
+		cin>>x;
+		push(x);
+	}
+	pop();
+	print();
+}
diff --git a/Data Structure Algo/C++/stack using linkedlist.cpp b/Data Structure Algo/C++/stack using linkedlist.cpp
new file mode 100644
index 00000000..4c0ba68d
--- /dev/null
+++ b/Data Structure Algo/C++/stack using linkedlist.cpp	
@@ -0,0 +1,46 @@
+#include<bits/stdc++.h>
+using namespace std;
+struct node{
+	int data;
+	node* next;
+};
+node* top=NULL;
+void push(int x){
+	node* temp=new node();
+	temp->data=x;
+	temp->next=NULL;
+	if(top==NULL){
+		top=temp;
+		return;
+	}
+	temp->next=top;
+	top=temp;
+}
+void pop(){
+	node* temp=top;
+	if(top==NULL){
+		cout<<"underflow";
+		return;
+	}
+	top=temp->next;
+	free(temp);
+}
+void print(){
+	node* temp=top;
+	while(temp!=NULL){
+		cout<<temp->data<<" ";
+		temp=temp->next;
+	}
+}
+int main(){
+	int n,x;
+	cout<<"Enter n: ";
+	cin>>n;
+	for(int i=0;i<n;i++){
+		cout<<"Enter x: ";
+		cin>>x;
+		push(x);
+	}
+	pop();
+	print();
+}