had:=======================================================an: FIND A PRIME NUMBER NO LARGER THAN THE NUMBER ENTERED.ax: USE PROBABILISTIC TEST BASED ON FERMAT'S THEOREM.b: SEE KNUTH, "SEMINUMERICAL ALGORITHMS".Ob:=======================================================jb: DEFINE PARAMETERS.rb:b N,P,X,Y : DOUBLE PRECISIONbK  : NUMBER OF TEST CASES