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These preliminary evaluations indicate students ' early progress and , if necessary , serve as a warning if any students are in danger of failing . The transaction may be automatically monitored , and parties would be warned if any behaviour outside the agreed terms of the contract takes place . These labels must give at least one satisfactory method of care and also must give a warning if any particular cleaning method would harm the garment or if no cleaning method is safe . For named parameters we have also taken advantage of the fact that we know the names of the parameters to report a handy informative warning if any of them are undefined . It is he , also , who gives warning if any one is to be married , or if any one is to die ; and he even gives the sign with something besides stones . The mblp class , in particular , will print a warning if any domain is in fact allowed to modify the protected type . a. if in the number processing we require full numbers we check that there are exactly four digits . Accordingly , the principle applied also to the German U-boats to help the shipwrecked of steamers sunk without warning if by doing so ( 1 ) the boat would not be endangered ; and ( 2 ) the accomplishment of the military mission would not be prejudiced . Remember that a curve y = f ( x ) has a vertical asymptote at a if at least one of the limits ( left , right , or both ) as x - > a is infinity or negative infinity .