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if the user chooses a negative number for shape choice then print out "negative shape not allowed", no further calculations or prompts should appear and program ends with your name and student number ...

Note that t (time) is multiplied by c (the speed of light) in the first entry of each four-vector. Thus, if X = [ct; x; y; z] and X' = [ct'; x'; y'; z'] are the four-vectors for ...