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Course Queries Competitions/Entrance Exams 2 years ago
Posted on 16 Aug 2022, this text provides information on Competitions/Entrance Exams related to Course Queries. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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I have this exam question:
Look at this example of pseudocode:
algorithm A(a, b) { // precond: a & b are type of Int // postcond: what does this function return? if (a == b) return( 0 ) else if (a < b) return (-A(b, a)) else return (A(a-1, b-1)); }
The answers given are:
Personally I think it's d), but I just wanted to make sure.
The function terminates when a==b; so to show that it doesn't terminate, you could show that a & b never get closer together with successive calls -- which in this case, is pretty easy.
a==b
(The above does not take into account overflow. Also, (d) can't be correct, since it doesn't loop at all.)
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