Exercise 10

Added Exercise 10 to Repo

Informatik_I/Exercise_10/Task_1a/README.org

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+#+title: Task 1a: Understanding Pointers: - Lookup
+
+#+author: JirR02
+* Task Description
+:PROPERTIES:
+:CUSTOM_ID: task-description
+:END:
+Complete the definition of function lookup by editing the file
+=lookup.cpp= according to its specified pre- and post conditions.
+
+We provide a test program using the implemented function to perform
+lookup on a vector.
+
+** Input
+:PROPERTIES:
+:CUSTOM_ID: input
+:END:
+The program accepts
+
+- the length of the vector, =l=,
+- =l= vector elements, and
+- a lookup index =i=.
+
+For example:
+
+means a 3-element vector =[9, 8, 7]= and the lookup index 1.
+
+** Output
+:PROPERTIES:
+:CUSTOM_ID: output
+:END:
+The test program prints the value of the element at the lookup index.
+
+For example, for the input given above, this value is 8.
+
+* Solution
+:PROPERTIES:
+:CUSTOM_ID: solution
+:END:
+#+begin_src cpp
+#include "lookup.h"
+
+// PRE:  0 <= i < vec.size()
+// POST: Returns the address of the i-th element of vec.
+const int *lookup(const std::vector<int> &vec, const int i) { return &vec[i]; }
+#+end_src