From 624111e06dee06a53ca76849b95d77e74ea217b9 Mon Sep 17 00:00:00 2001
From: Aman Agarwal <39858354+agarwalaman786@users.noreply.github.com>
Date: Sat, 10 Oct 2020 08:49:51 +0530
Subject: [PATCH] Add files via upload

---
 c++_basic/constructor.cpp   | 29 +++++++++++++++++++++++++++++
 c++_basic/destructor.cpp    | 30 ++++++++++++++++++++++++++++++
 c++_basic/files.cpp         | 10 ++++++++++
 c++_basic/hello.txt         |  1 +
 c++_basic/virtual.cpp       | 31 +++++++++++++++++++++++++++++++
 c++_basic/virtual_class.cpp | 32 ++++++++++++++++++++++++++++++++
 6 files changed, 133 insertions(+)
 create mode 100644 c++_basic/constructor.cpp
 create mode 100644 c++_basic/destructor.cpp
 create mode 100644 c++_basic/files.cpp
 create mode 100644 c++_basic/hello.txt
 create mode 100644 c++_basic/virtual.cpp
 create mode 100644 c++_basic/virtual_class.cpp

diff --git a/c++_basic/constructor.cpp b/c++_basic/constructor.cpp
new file mode 100644
index 000000000..adfbffe8c
--- /dev/null
+++ b/c++_basic/constructor.cpp
@@ -0,0 +1,29 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+class A{
+  private:
+	int a,b;
+  public:
+  	A(){
+
+  	}
+  	A(int x, int y){
+  		a = x;
+  		b = y;
+  	}
+  	void show(){
+  		cout<<a<<" "<<b<<endl;
+  	}
+};
+
+
+int main(){
+	A *a1 = new A[10];
+	for(int i=0;i<10;i++){
+		a1[i] = A(3,4);
+	}
+	a1[0].show();
+	A a2(4,5);
+	a2.show();
+}
\ No newline at end of file
diff --git a/c++_basic/destructor.cpp b/c++_basic/destructor.cpp
new file mode 100644
index 000000000..bf3e6761d
--- /dev/null
+++ b/c++_basic/destructor.cpp
@@ -0,0 +1,30 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+
+class A{
+	int *a;
+public:
+	A(){
+		a = new int;
+		*a = 4;
+		cout<<*a<<endl;
+	}
+	void show(){
+		cout<<*a;
+	}
+	~A(){
+		delete a;
+		cout<<"hello";
+	}
+};
+
+
+
+int main(){
+	//In this destructir is not called when memory is created using new keyword then one need to delete it using delete keyword
+	A *a= new A;
+	a->show();
+	delete a;
+	a->show();
+}
\ No newline at end of file
diff --git a/c++_basic/files.cpp b/c++_basic/files.cpp
new file mode 100644
index 000000000..c224e8d56
--- /dev/null
+++ b/c++_basic/files.cpp
@@ -0,0 +1,10 @@
+#include<bits/stdc++.h>
+#include<fstream>
+using namespace std;
+int main(){
+	//oftsream is for output and ifstream is for input
+	ofstream fout;
+	fout.open("hello.txt");
+	fout<<"hello Aman";
+	fout.close();
+}
\ No newline at end of file
diff --git a/c++_basic/hello.txt b/c++_basic/hello.txt
new file mode 100644
index 000000000..24abee3f7
--- /dev/null
+++ b/c++_basic/hello.txt
@@ -0,0 +1 @@
+hello Aman
\ No newline at end of file
diff --git a/c++_basic/virtual.cpp b/c++_basic/virtual.cpp
new file mode 100644
index 000000000..9654f88ea
--- /dev/null
+++ b/c++_basic/virtual.cpp
@@ -0,0 +1,31 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+class A{
+	int a,b;
+public:
+	void setdata(int a, int b){
+		a = a,b = b;
+	}
+	virtual void display(){
+		cout<<"hi"<<"a";
+	}
+	
+};
+
+class B: public A{
+private:
+	int a,b;
+public:
+	void display(){
+		cout<<"hello";
+	}
+};
+
+int main(){
+	A *p;
+	B obj2;
+	p = &obj2;
+	//It should be of A class;
+	p->display();
+}
\ No newline at end of file
diff --git a/c++_basic/virtual_class.cpp b/c++_basic/virtual_class.cpp
new file mode 100644
index 000000000..b7cbd7f77
--- /dev/null
+++ b/c++_basic/virtual_class.cpp
@@ -0,0 +1,32 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+class A
+{
+	int a;
+public:
+	virtual  void fun(){
+		cout<<"I am in A";
+	}
+	virtual  void fun1(){
+		cout<<"I am in A";
+	}
+};
+class B: public A{
+	//int b;
+public:
+	void fun(){
+
+	}
+	void fun1(){
+
+	}
+};
+
+
+int main(){
+	A o1;
+	B o2;
+	cout<<sizeof(o1)<<" "<<sizeof(o2);
+	return 0;
+}
\ No newline at end of file