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An existing variable can at all times
be bound to a new value by means of a variable assignment:
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name := expression |
The following:
will result in the originally computed
value of pi to be replaced by a -possibly- more accurate
approximation of. Clearly, a variable assignment can only take place
if the variable has been defined previously; if this is not the case,
an error is generated; in case the same name is used for several
variables, the most recent version is used.