Exercise 1:

Modify the circunference going over three points exercise to detect error conditions.

Introduce the code necessary to detect if the points are repeated or are aligned. Print a error message in these cases.

Exercise 2:

Write a program to display tables like the following: 
1 2 3 4 5
2 3 4 5 6
3 4 5 6 7
4 5 6 7 8
5 6 7 8 9
where the size of the table must be a parameter.

Exercise 3:

Write a program to display a pyramid. The size of the pyramid must be a parameter. 
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Exercise 4:

Write a program to display a circle. The radius of the circle must be a parameter. 
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