In Display 10.11, %SYSEVALFevaluated the logical comparison &NPTS<1.
%SYSEVALFis a general evaluation function. On the other hand, the %EVAL function
handles integer arithmetic. Many other functions are available for macro programming.
%INDEXfinds the position of a string in a source string. %LENGTHreturns the length
of an argument and checks for valid arguments. %SCANdisplays a particular word in an
argument. %SUBSTRextracts a substring from an argument. In a previous example,
%UPCASE converted an argument to all uppercase. Display 10.17 provides a short
examp ...
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