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 val()               Convert a string to a double-precision number
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 Declaration
   string.hdr

 Syntax
   func dbl val extern
   param const char cString

 Arguments
   cString is the string to convert.

 Return
   A numeric representation of the input string.

 Description
   The val() function converts cString to a double-precision number.
   Use the val() function if it is necessary to have great precision. For
   general use, and for speed increase, use the ival() function.

 Example
   #define EXAMPLE_STRING
   #include example.hdr

   proc Test_val
   ? val( "99.1234" )         // Result:   99.1234
   ? val( "99A12" )           // Result:   99
   ? val( "B52" )             // Result:    0
   ? val( "" )                // Result:    0
   ? val( space( 1 ) )        // Result:    0
   ? val( " 96.54" )          // Result:   96.54
   ? val( "96 .54" )          // Result:   96
   endproc

   proc main
   Test_val()
   endproc