Exercise 8

Added Exercise 8 to repository

Informatik_I/Exercise_8/Task_1/README.org

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+#+title: Task 1: Reverse Digits
+
+#+author: JirR02
+* Task
+:PROPERTIES:
+:CUSTOM_ID: task
+:END:
+The goal of this task is to implement a program to read a number and
+print its reverse.
+
+You should complete the implementation of the reverse function in
+=reverse.cpp=. This function gets an =int= as input parameter, and it
+should print the digits of the number in reverse.
+
+The =reverse= function must be implemented recursively (without any
+loop). To enforce this, we disallow the use of =for= or =while=.
+
+* Input
+:PROPERTIES:
+:CUSTOM_ID: input
+:END:
+The input is a single non-negative =int= number.
+
+An input example:
+
+#+begin_src shell
+  321231
+#+end_src
+
+* Output
+:PROPERTIES:
+:CUSTOM_ID: output
+:END:
+For the above input, the output should be:
+
+#+begin_src shell
+  132123
+#+end_src
+
+Note: You are not allowed to use the string library to solve this task!
+
+* Solution
+:PROPERTIES:
+:CUSTOM_ID: solution
+:END:
+#+begin_src cpp
+#include "reverse.h"
+#include <iostream>
+
+// PRE: n >= 0
+// POST: print the digits of the input in reverse order to std::cout
+void reverse(int n) {
+
+  int res = n % 10;
+  std::cout << res;
+
+  int new_int = n / 10;
+
+  if (new_int == 0) {
+    return;
+  }
+
+  reverse(new_int);
+}
+#+end_src
+
+--------------
+
+Made by JirR02 in Switzerland 🇨🇭