Exercise 9

Added Exercise 9 to repository

Informatik_I/Exercise_9/Task_3/README.org

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+#+title: Task 3: Averager
+
+#+author: JirR02
+* Task
+:PROPERTIES:
+:CUSTOM_ID: task
+:END:
+Write a class =Averager= that computes averages of given values of type
+=double=.
+
+Initially, an instance of class =Averager= does not contain any value.
+The class =Averager= must provide the following functionality:
+
+#+begin_src cpp
+// POST: Adds a value to the current average calculation.
+void add_value(double value);
+
+// POST: Returns the average of all added values,
+//       or zero, if no value has been added.
+double get_average();
+
+// POST: Removes all values from the current average calculation.
+void reset();
+#+end_src
+
+The declaration and implementation of class Averager must be split
+between header file (=averager.h=, containing declaration) and
+implementation file (=averager.cpp=, containing implementation).
+
+/Note: The above functions have already been declared in averager.h for
+you. You only need to provide function definitions in/ =averager.cpp=.
+
+* Solution
+:PROPERTIES:
+:CUSTOM_ID: solution
+:END:
+#+begin_src cpp
+#include "averager.h"
+
+void Averager::add_value(double value) {
+  sum += value;
+  ++count;
+}
+
+double Averager::get_average() {
+  double res;
+  if (count == 0)
+    res = 0;
+  else
+  res = sum / count;
+  return res;
+}
+
+void Averager::reset() {
+  sum = 0;
+  count = 0;
+}
+#+end_src
+
+--------------
+
+Made by JirR02 in Switzerland 🇨🇭