Esercitazione 2 

1) Compute the sum of the first n integer numbers. n is arbitrary and is given by the user.
   Use a while loop to calculate the sum. (SumNumbers.cpp)

2) Write a program which, given an arbitrary set  of positive integer numbers, finds how many are odd numbers and how many are even numbers. 
   Use a  while loop. (EvenOdd.cpp)

3) Write a program which reads an integer numbers and prints as many as "*" as the input number (histo.cpp)

   bash$ ./histo
   Enter a positive integer number, -1 to exit 3
   ***
   Enter a positive integer number, -1 to exit 7
   *******
   Enter a positive integer number, -1 to exit 4
   ****
   Enter a positive integer number, -1 to exit -1

4) Write a program which draws a right-angled triangle with sides equal to the input number (Triangular.cpp)
 
   bash$ ./triangular
   Side length: 6
   * 
   * * 
   * * * 
   * * * * 
   * * * * * 
   * * * * * * 

5) Modify the program of point 4) in order to obtain a triangle as shown below (ReflectedTriangular.cpp)

   bash$ ./reflected
   Side length: 5
           * 
         * * 
       * * * 
     * * * * 
   * * * * *