I finally understood your problem. The problem description needs some adjustment. It is not clear that it is requesting only the global variable named 'z'. I thought it was referring to every global variable.
Program an exclusive OR operation with logical operators
What are the odds?
Project Euler: Problem 6, Natural numbers, squares and sums.
Sum of first n terms of a harmonic progression
Testing for randomness: uniform distribution of integers
Computational power of Cody servers
Rate of event occurence: find percentiles of the distribution (for smallish rates)
What score did they give?
Anyone for tennis? Your chances of winning a tie-break game
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