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diff --git a/‎18.IO Streams/a.txt
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diff --git a/‎18.IO Streams/product.txt
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diff --git a/‎18.IO Streams/student.txt b/‎18.IO Streams/student.txt
diff --git a/‎19.STL/1_demo_stl_classes.cpp
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diff --git a/‎19.STL/2_map_classes.cpp
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diff --git a/‎19.STL/3_practice_student_exercise.cpp
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@@ -0,0 +1,17 @@
+# include<iostream>
+# include<vector>
+using namespace std;
+    
+int main()
+{
+	vector<int> v={2,4,6,8,10};
+	v.push_back(20);
+	v.push_back(30);
+	vector<int>::iterator itr;
+	cout<<"using iterator"<<endl;
+	for(itr=v.begin();itr!=v.end();itr++)
+		cout<<++*itr<<endl;
+	cout<<"using for each loop"<<endl;
+	for(int x:v)
+		cout<<x<<endl;
+}
@@ -0,0 +1,20 @@
+# include<iostream>
+# include<map>
+using namespace std;
+    
+int main()
+{
+	map<int,string> m;
+	m.insert(pair<int,string>(1,"Micheal"));
+	m.insert(pair<int,string>(2,"Jim"));
+	m.insert(pair<int,string>(3,"Dwight"));
+	map<int,string>::iterator itr;
+	for(itr=m.begin();itr!=m.end();itr++)
+	{
+		cout<<itr->first<<" "<<itr->second<<endl;
+	}
+	map<int,string>::iterator itr1;
+	itr1=m.find(2);
+	cout<<"value at 2:"<<endl;
+	cout<<itr1->first<<" "<<itr1->second<<endl;
+}
@@ -0,0 +1,73 @@
+#include<iostream>
+#include<fstream>
+#include<vector>
+using namespace std;
+
+class Item{
+    private:
+        string name;
+        float price;
+        int qty;
+    public:
+        Item(){}
+        Item(string n,float p,int q);
+        friend ifstream & operator>>(ifstream &fis,Item &i);
+        friend ofstream & operator<<(ofstream &fos,Item &i);
+        friend ostream & operator<<(ostream &os,Item &i);
+
+};
+
+Item::Item(string n,float p,int q){
+    name=n;
+    price=p;
+    qty=q;
+}
+
+ofstream & operator<<(ofstream &fos,Item &i){
+    fos<<i.name<<endl<<i.price<<endl<<i.qty<<endl;
+    return fos;
+}
+
+ifstream & operator>>(ifstream &fis,Item &i){
+    fis>>i.name>>i.price>>i.qty;
+    return fis;
+}
+
+ostream & operator<<(ostream &os,Item &i){
+    os<<i.name<<endl<<i.price<<endl<<i.qty<<endl;
+    return os;
+}
+
+int main(){
+    int n;
+    string name;
+    float price;
+    int qty;
+
+    cout<<"Enter number of Item:";
+    cin>>n;
+
+    vector<Item *> list;
+    cout<<"Enter All Item "<<endl;
+    for(int i=0;i<n;i++){
+        cout<<"Enter "<<i+1<<" Item Name , price and quantity";
+        cin>>name;
+        cin>>price;
+        cin>>qty;
+        list.push_back(new Item(name,price,qty));
+    }
+
+    ofstream fos("items.txt");
+    vector<Item *>::iterator itr;
+
+    for(itr=list.begin();itr!=list.end();itr++){
+        fos<<**itr;
+    }
+
+    Item item;
+    ifstream fis("items.txt");
+    for(int i=0;i<n;i++){
+        fis>>item;
+        cout<<"Item "<<i<<endl<<item<<endl;
+    }
+}