diff --git a/file.org b/file.org
index 8d9f67f..4330733 100644
--- a/file.org
+++ b/file.org
@@ -32,3 +32,7 @@
 * Lab 6
 #+INCLUDE: ./lab6/file.org
 #+LATEX: \clearpage
+
+* Lab 7
+#+INCLUDE: ./lab7/file.org
+#+LATEX: \clearpage
diff --git a/file.pdf b/file.pdf
index 8889035..f028272 100644
Binary files a/file.pdf and b/file.pdf differ
diff --git a/lab2/file.org b/lab2/file.org
index 9b3a713..38c72bb 100644
--- a/lab2/file.org
+++ b/lab2/file.org
@@ -206,7 +206,7 @@ void Student::input() {
   cin >> this->age;
   cout << "Gender (m/f): ";
   cin >> this->gender;
-  
+
   cout << "Enter Marks for" << endl;
 
   for (i = 0; i < NSUBS; i++) {
diff --git a/lab7/19.cpp b/lab7/19.cpp
new file mode 100644
index 0000000..9d9bf15
--- /dev/null
+++ b/lab7/19.cpp
@@ -0,0 +1,22 @@
+#include <iostream>
+using namespace std;
+
+class Foo {
+  int x;
+
+public:
+  Foo(int _x) { x = _x; };
+  Foo &operator++();
+  int get() { return x; }
+};
+
+Foo &Foo::operator++() {
+  x++;
+  return *this;
+}
+
+int main() {
+  Foo bar = Foo(-3);
+  ++bar;
+  cout << bar.get();
+}
diff --git a/lab7/20.cpp b/lab7/20.cpp
new file mode 100644
index 0000000..d656cf6
--- /dev/null
+++ b/lab7/20.cpp
@@ -0,0 +1,22 @@
+#include <iostream>
+using namespace std;
+
+class Foo {
+  int x;
+
+public:
+  Foo(int _x) { x = _x; };
+  Foo operator+(Foo);
+  int get() { return x; }
+};
+
+Foo Foo::operator+(Foo bar) {
+  return Foo(x + bar.get());
+}
+
+int main() {
+  Foo bar = Foo(-3);
+  Foo baz = Foo(8);
+
+  cout << (bar + baz).get();
+}
diff --git a/lab7/21.cpp b/lab7/21.cpp
new file mode 100644
index 0000000..6ba380f
--- /dev/null
+++ b/lab7/21.cpp
@@ -0,0 +1,22 @@
+#include <iostream>
+using namespace std;
+
+class Foo {
+  int x;
+
+public:
+  Foo(int _x) { x = _x; };
+  Foo operator*(Foo);
+  int get() { return x; }
+};
+
+Foo Foo::operator*(Foo bar) {
+  return Foo(x * bar.get());
+}
+
+int main() {
+  Foo bar = Foo(-3);
+  Foo baz = Foo(8);
+
+  cout << (bar * baz).get();
+}
diff --git a/lab7/file.org b/lab7/file.org
new file mode 100644
index 0000000..01e6868
--- /dev/null
+++ b/lab7/file.org
@@ -0,0 +1,87 @@
+* Write a program to overload (++) operator.
+
+#+ATTR_LATEX: :options frame=single,breaklines=true
+#+begin_src cpp :tangle 19.cpp :results output :exports both :wrap src text
+#include <iostream>
+using namespace std;
+
+class Foo {
+  int x;
+
+public:
+  Foo(int _x) { x = _x; };
+  Foo &operator++();
+  int get() { return x; }
+};
+
+Foo &Foo::operator++() {
+  x++;
+  return *this;
+}
+
+int main() {
+  Foo bar = Foo(-3);
+  ++bar;
+  cout << bar.get();
+}
+#+end_src
+
+#+LATEX: \clearpage
+
+* Write a program to overload + operator.
+
+#+ATTR_LATEX: :options frame=single,breaklines=true
+#+begin_src cpp :tangle 20.cpp :results output :exports both :wrap src text
+#include <iostream>
+using namespace std;
+
+class Foo {
+  int x;
+
+public:
+  Foo(int _x) { x = _x; };
+  Foo operator+(Foo);
+  int get() { return x; }
+};
+
+Foo Foo::operator+(Foo bar) {
+  return Foo(x + bar.get());
+}
+
+int main() {
+  Foo bar = Foo(-3);
+  Foo baz = Foo(8);
+
+  cout << (bar + baz).get();
+}
+#+end_src
+
+#+LATEX: \clearpage
+
+* Write a program to overload * operator.
+
+#+ATTR_LATEX: :options frame=single,breaklines=true
+#+begin_src cpp :tangle 21.cpp :results output :exports both :wrap src text
+#include <iostream>
+using namespace std;
+
+class Foo {
+  int x;
+
+public:
+  Foo(int _x) { x = _x; };
+  Foo operator*(Foo);
+  int get() { return x; }
+};
+
+Foo Foo::operator*(Foo bar) {
+  return Foo(x * bar.get());
+}
+
+int main() {
+  Foo bar = Foo(-3);
+  Foo baz = Foo(8);
+
+  cout << (bar * baz).get();
+}
+#+end_src