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Undefined references occur in programs when a program tries to access a variable that has not previously been declared.
Picture this scenario:
You have 2 Oranges and 3 apples
Add the number of oranges to the number of ilikons
Any sensible person would simply ask: what are "ilikons"?
A program will not however ask that. It will just stop and report undefined reference to ilikons (at best).
A related error is the non-initialized vriable, which in some languages comes up as undefined variables as well.
You have 2 oranges and some apples
Add the number of oranges to the number of apples
We have declared the apples - but we haven't stated how many there were, and adding that unknown number to anything still mkaes no practical sense.
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The Code Is Undefined The Code Is Undefined The Code Is Undefined The Code Is Undefined
