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Page History: ZPad$() - pad a number with leading zeroes

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Page Revision: 2021/11/28 09:00

Some time it is nice to have leading zeroes on a number. MMBasic helpfully removes these for you which means to have them, the number must be returned as a string.

This tiddly Function does just that, it returns the integer value x, padded to length y with leading zeroes as a string. The same functionality can be produced with STR$() but is more involved.

Restrictions
Due to the method used for a fast result, the string passed in or the desired size, cannot exceed 127 characters. Any higher will cause an error due to the concatenation attempting to create a string longer than 255 bytes. In practice this is unlikely to be an issue.

Syntax:
=ZPad$(number,totalNumDigits)

Example:
Print ZPad$(7,3)' returns "007"

Code:

  Function ZPad$(x As integer,y As integer)
    ZPad$=Right$(String$(y,"0")+Str$(x),y)
  End Function