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• Expression is either a numeric or a string expression;
• Format$ is a string containing the format instructions.
  The following values are possible:
• Numeric expression:
• "Ix" -> integer (=I) with x positions:
  FORMAT$(Pi,"I3") returns "  3"
• "Ex.y" -> exponential format (=E), x positions for total number, y decimal positions:
  FORMAT$(Pi,"E12.3") returns "   0.314E+01"
• "Fx.y" -> fixed format (=F), x positions for total number, y decimal positions:
  FORMAT$(Pi,"F12.3") returns "       3.142"
• String expression:
• Ax -> ASCII text (=A) with x positions:
  FORMAT$("Qnowledge Wageningen","A25") returns "Qnowledge Wageningen     "
• Special actions:
• "Xs|Format$" adds s amount of leading spaces to the returned value
• "Format$|Xs" adds s amount of trailing spaces to the returned value
  FORMAT$("Qnowledge", "X2|A9|X3")
  returns
  "  Qnowledge   "
• "Format$/|" adds a [CRLF] to the returned value
  FORMAT$("Qnowledge", "X2|A9|X3/|") + FORMAT$("BV", "A2") 
  returns
  "  Qnowledge   
  BV"

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