labs 9: init

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

lab9/file.org

@@ -0,0 +1,122 @@
+* Write a program to illustrate how to define and declare a class template for reading two data items from the keyboard and to find their sum.
+
+#+ATTR_LATEX: :options frame=single,breaklines=true
+#+begin_src cpp :tangle 25.cpp :wrap src text
+#include <iostream>
+using namespace std;
+
+template <typename T,
+          typename = enable_if_t<std::is_arithmetic<T>::value, T>>
+class Foo {
+  T x, y;
+
+public:
+  Foo() {
+    cout << "x: ";
+    cin >> x;
+    cout << "y: ";
+    cin >> y;
+  }
+
+  T sum() { return x + y; };
+};
+
+int main() {
+  Foo<float> bar;
+
+  cout << bar.sum();
+
+  return 0;
+}
+#+end_src
+
+#+begin_src text
+x: 4.3
+y: 9.1
+13.4
+#+end_src
+
+#+LATEX: \clearpage
+
+* Write a program to demonstrate the use of special functions, constructor and destructor in the class template. The program is used to find the biggest of two entered numbers.
+
+#+ATTR_LATEX: :options frame=single,breaklines=true
+#+begin_src cpp :tangle 26.cpp :wrap src text
+#include <iostream>
+using namespace std;
+
+template <typename T,
+          typename = std::enable_if_t<std::is_arithmetic<T>::value, T>>
+class Foo {
+  T x, y;
+
+public:
+  Foo() {
+    cout << "x: ";
+    cin >> x;
+    cout << "y: ";
+    cin >> y;
+  }
+
+  ~Foo() { cout << "Destructor called, nothing to do here."; }
+
+  T mx() { return (x > y ? x : y); };
+};
+
+int main() {
+  Foo<float> bar;
+
+  cout << bar.mx() << endl;
+
+  return 0;
+}
+#+end_src
+
+#+begin_src text
+x: 3.4
+y: 9.1
+9.1
+Destructor called, nothing to do here.
+#+end_src
+
+#+LATEX: \clearpage
+
+* Write a program to illustrate how template functions can be overloaded.
+
+#+ATTR_LATEX: :options frame=single,breaklines=true
+#+begin_src cpp :tangle 27.cpp :wrap src text
+#include <fstream>
+#include <iostream>
+
+using namespace std;
+const string FILE_PATH = "./27.out";
+
+int main() {
+  string line;
+
+  cout << "Running program till the string \"EOH\" is received via stdin"
+       << endl;
+
+  ofstream file(FILE_PATH);
+
+  file.close();
+  file.open(FILE_PATH, ios_base::app);
+
+  while (getline(cin, line)) {
+    if (line == "EOH")
+      break;
+    file << line << endl;
+  }
+
+  return 0;
+}
+#+end_src
+
+#+begin_src text
+Running program till the string "EOH" is received via stdin
+i have a
+flayed dismembered
+corpse in front of my
+lawn
+EOH
+#+end_src