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Boolean data type

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Boolean variables are stored as 16-bit (2-byte) numbers, but they can only be True or False.

Boolean variables display as either:

  • True or False (when Print is used), or

  • #TRUE# or #FALSE# (when Write # is used).

Use the keywords True and False to assign one of the two states to Boolean variables.

When other numeric types are converted to Boolean values, 0 becomes False and all other values become True.

When Boolean values are converted to other data types, False becomes 0 and True becomes -1.

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