Examples

   1.$ INQUIRE CHECK "Enter Y[ES] to continue"
     $ IF .NOT. CHECK THEN EXIT

     The INQUIRE command displays the following prompting message at
     the terminal:

       Enter Y[ES] to continue:

     The INQUIRE command prompts for a value, which is assigned
     to the symbol CHECK. The IF command tests the value assigned
     to the symbol CHECK. If the value assigned to CHECK is true
     (that is, an odd numeric value, a character string that begins
     with a T, t, Y, or y, or an odd numeric character string), the
     procedure continues executing.

     If the value assigned to CHECK is false (that is, an even
     numeric value, a character string that begins with any letter
     except T, t, Y, or y, or an even numeric character string), the
     procedure exits.

   2.$ INQUIRE COUNT
     $ IF COUNT .GT. 10 THEN GOTO SKIP
       .
       .
       .
     $ SKIP:

     The INQUIRE command prompts for a count with the following
     message:

       COUNT:

     Then the command procedure uses the value of the symbol COUNT
     to determine whether to execute the next sequence of commands
     or to transfer control to the line labeled SKIP.

   3.$ IF P1 .EQS. "" THEN INQUIRE P1 "FILE NAME"
     $ FORTRAN 'P1'

     The IF command checks whether a parameter was passed to the
     command procedure by checking if the symbol P1 is null; if
     it is, it means that no parameter was specified, and the
     INQUIRE command is issued to prompt for the parameter. If P1
     was specified, the INQUIRE command is not executed, and the
     Fortran command compiles the name of the file specified as a
     parameter.