Update README.md

Author: Psingh12354

README.md

@@ -9,13 +9,13 @@ The containers are implemented as generic class templates, means that a containe
 
 Following are some common containers :
 
-# vector : replicates arrays
-# queue : replicates queues
-# stack : replicates stack
-# priority_queue : replicates heaps
-# list : replicates linked list
-# set : replicates trees
-# map : associative arrays
+### vector : replicates arrays
+### queue : replicates queues
+### stack : replicates stack
+### priority_queue : replicates heaps
+### list : replicates linked list
+### set : replicates trees
+### map : associative arrays
 
 # Classification of Containers in STL
 Containers are classified into four categories :
@@ -105,7 +105,8 @@ int main ()
 Site Link : https://www.studytonight.com/cpp/stl/stl-pair-template
 
 # C++ My Codes : 
-# Calculator 
+
+## Calculator 
 ``` 
 #include <iostream>
 using namespace std;
@@ -155,7 +156,7 @@ int main()
 	return 0;
 }
 ```
-# Container 
+## Container 
 ```
 /*
 Container library is collection of classes
@@ -171,7 +172,7 @@ int main()
 	return 0;
 }
 ```
-# Function Templates
+## Function Templates
 
 Templates are powerful features of C++ which allows you to write generic programs. In simple terms, you can create a single function or a class to work with different data types using templates.
 Templates are often used in larger codebase for the purpose of code reusability and flexibility of the programs.
@@ -226,7 +227,7 @@ int main()
 }
 ```
 
-# Pair Template
+## Pair Template
 
 ```
 /*Templates are powerful features of C++ which allows you to write generic programs. In simple terms, you can create a single function or a class to work with different data types using templates.
@@ -280,7 +281,7 @@ int main()
 	return 0;
 }
 ```
-# Swap Templates
+## Swap Templates
 
 ```
 #include<iostream>
@@ -319,7 +320,7 @@ int main()
 }
 ```
 
-# Vector Size
+## Vector Size
 
 ```
 #include<iostream>
@@ -347,3 +348,63 @@ int main()
 	return 0;
 }
 ```
+##
+```
+/*
+Array is collection of similar element
+STL has predefine class array
+like this
+array<int,4> obj;
+Here a array is formed with side 4
+to use this you need to include array
+template<place holder>
+class array{
+};
+*/
+#include<iostream>
+#include<array>
+using namespace std;
+int main()
+{
+array<int,4> data1={2,5,6,7};
+// use this extra array with swap
+array<int,4> data2={1,4,5,9};
+// we can also initilize it here
+// like this
+// array<int,4> data={2,5,6,8};}
+// it show some error
+// to fix it click on setting
+// if you are using dev then check on tool comiler option read the error and copy it on genneral add by tick
+cout<<data1.at(1)<<endl; // it show index array start from 0
+cout<<data1[2]<<endl;
+cout<<data1.front()<<endl;
+cout<<data1.back()<<endl;
+for(int i=0;i<=data1.size();i++)
+{
+	cout<<data1[i]<<" ";
+}
+cout<<"\n";
+data1.fill(10);
+for(int i=0;i<=data1.size();i++)
+{
+
+cout<<data1[i]<<" ";
+// to store 1 element in hole array
+}
+cout<<"\n";
+// swap
+data1.swap(data2);
+for(int i=0;i<=data1.size();i++)
+{
+cout<<data1[i]<<" ";
+}
+cout<<"\n";
+for(int i=0;i<=data2.size();i++)
+{
+cout<<data2[i]<<" ";
+}
+cout<<"\n";
+// to find the size
+cout<<data1.size();
+}
+```